What is osseous structures in lungs

Overview. The chest wall is comprised of skin, fat, muscles, and the thoracic skeleton. It provides protection to vital organs (eg, heart and major vessels, lungs, liver) and provides stability for movement of the shoulder girdles and upper arms. Although the thoracic skeleton consists of rigid bones and cartilage, its interconnection with the ...

What is osseous structures in lungs. Please read the disclaimer. Lung bases are clear is a common term in radiology reports which means that the lower part of the lungs is free of abnormalities. This is a term that is most commonly used in CT of the abdomen. CT of the abdomen which is commonly done with CT of the pelvis includes the lung bases. The lung bases are the …

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The lungs (plural in Latin: pulmones, singular: pulmo) are the main respiratory organs located in the thorax. There are two lungs in the human body - right and left. They are expandable organs with a spongy structure that occupy most of the thoracic cavity and are situated on both sides of the mediastinum. The lungs are the central organs of ...Pulmonary ossification refers to bone tissue formation (calcification in a collagen matrix), with or without marrow elements, in the lung parenchyma. While other organs can be affected by ectopic calcification and ossification, the lungs are particularly susceptible [ 1 ].Chronic obstructive pulmonary disease (COPD) often leads to hyperinflated lungs. COPD is a long-term lung disease that makes it hard for air to flow in and out of the lungs. The two most common forms of COPD are emphysema and long-term bronchitis. Often the two conditions happen together. Certain other lung problems, such as asthma and cystic ...The pleura help your lungs expand and contract with each breath and contain pleural fluid that lubricates this movement. The inner edge of the hilum acts as a channel where a number of structures ...Osteocytes, bone cells like chondrocytes, are located within lacunae. The histology of transverse tissue from long bone shows a typical arrangement of osteocytes in concentric circles around a central canal. Bone is a highly vascularized tissue. Unlike cartilage, bone tissue can recover from injuries in a relatively short time.

Despite this, the power of the X-ray beam used is usually not optimised to view the bones, but rather to give greater detail to the lungs and soft tissues. For this reason abnormalities of the bones may not be obvious and so must be searched for carefully. Bones visible on a chest X-ray include the ribs, clavicles, scapulae, humeri, and the spine. A tracheoesophageal fistula is an abnormal passageway between the trachea and the esophagus that lets swallowed food get inside the trachea and the lungs. A fistula can lead to choking, gagging, trouble breathing, and bluish skin due to the lack of oxygen ( cyanosis ). A complication is aspiration pneumonia .Jun 6, 2023 · 1/8. Synonyms: Chest wall. The thoracic cage, also known as the rib cage, is the osteocartilaginous structure that encloses the thorax. It is formed by the 12 thoracic vertebrae, 12 pairs of ribs and associated costal cartilages and the sternum . The thoracic cage takes the form of a domed bird cage with the horizontal bars formed by ribs and ... The erythrocyte, commonly known as a red blood cell (or RBC), is by far the most common formed element: A single drop of blood contains millions of erythrocytes and only thousands of leukocytes (Figure 18.3.1).Specifically, males have about 5.4 million erythrocytes per microliter (µL) of blood, and females have approximately 4.8 million per µL.In fact, erythrocytes are estimated to make up ...The purpose of the lung is to provide oxygen to the blood. The respiratory system divides into airways and lung parenchyma. The airways consist of the bronchus, which bifurcates off the trachea and divides into bronchioles and then further into alveoli. The parenchyma is responsible for gas exchange and includes the alveoli, alveolar ducts, and bronchioles. Lungs have a spongy texture and have ...The costal surface of the lung borders the ribs. The mediastinal surface faces the midline. Figure 22.2.1 Gross Anatomy of the Lungs. Each lung is composed of smaller units called lobes. Fissures separate these lobes from each other. The right lung consists of three lobes: the superior, middle, and inferior lobes.Structure of the Lungs (A-level Biology) Structure of the Lungs Gas Exchange The Route for Gas Exchange. Gas exchange in humans (and most animals) is carried out by a complex organ system, known as the respiratory system.. Though there are many parts to the system, the most commonly thought of is the lungs.The diagram below briefly outlines the process of air entering out body and carbon ...The purpose of the lung is to provide oxygen to the blood. The respiratory system divides into airways and lung parenchyma. The airways consist of the bronchus, which bifurcates off the trachea and divides into bronchioles and then further into alveoli. The parenchyma is responsible for gas exchange and includes the alveoli, alveolar ducts, and bronchioles. Lungs have a spongy texture and have ...

Summary. When you lose bone minerals quicker than you can replace them, it's called bone demineralization. This can lead to other health conditions, including osteoporosis. About 60% of your ...Glandular epithelium is an epithelial tissue involved in the production and release of different secretory products (e.g., sweat, saliva, mucus, digestive enzymes, hormones). It is arranged into structures known as glands, which can be a single secretory cell (e.g., goblet cells) or a group of secretory cells (e.g., salivary glands ). What is osseous structures in lungs? Introduction: Pulmonary ossification (PO) is a rare pathologic finding, defined as a widespread heterotopic bone formation within the lungs. PO occurs in two forms. The first form is the nodular circumscribed type; the second form is the racemose or branching type. Males are more often affected than females. The human lungs are a pair of spongy organs within the thoracic cavity that facilitate gaseous exchange. They are a part of the respiratory system, which also includes the nose, nasal sinuses, mouth, …Overview. The chest wall is comprised of skin, fat, muscles, and the thoracic skeleton. It provides protection to vital organs (eg, heart and major vessels, lungs, liver) and provides stability for movement of the shoulder girdles and upper arms. Although the thoracic skeleton consists of rigid bones and cartilage, its interconnection with the ...Lung parenchyma consists of the delicate, functional tissue of the lungs. This tissue is made up of two main components: alveoli and interstitium. Alveoli: Alveoli are tiny air sacs responsible for the exchange of oxygen and carbon dioxide in the lungs. These small sacs resemble clusters of grapes and play a crucial role in respiration.

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Please read the disclaimer. A lung opacity is a frequently used term by radiologists on chest X-rays and essentially means a white spot of uncertain significance. The lungs are normally black on a chest X-ray so anything that blocks the X-rays from getting through will look white on an X-ray. A white spot amidst the normal black lungs …Bone Structure. Liver Microanatomy . Heart and Diaphragm . Larynx . Base of Head . Small Liver Model . Liver Denoyer Model . Kidney Denoyer Model Disc/MRI Head . Smooth Muscle . Heart and Lung Larynx is missing . Brain Stem Enlarged 3X. Nerves of the Head. Brain Stem (SOMSO) - Detailed. Cranial Layers . Diencephalon. Ventricles and Basal Nuclei ...The costal surface of the lung borders the ribs. The mediastinal surface faces the midline. Figure 22.2.1 Gross Anatomy of the Lungs. Each lung is composed of smaller units called lobes. Fissures separate these lobes from each other. The right lung consists of three lobes: the superior, middle, and inferior lobes.1/8. Synonyms: Chest wall. The thoracic cage, also known as the rib cage, is the osteocartilaginous structure that encloses the thorax. It is formed by the 12 thoracic vertebrae, 12 pairs of ribs and associated costal cartilages and the sternum . The thoracic cage takes the form of a domed bird cage with the horizontal bars formed by ribs and ...AnswerBot. ∙ 1mo ago. If osseous structures are unremarkable, it means that there are no significant abnormalities, deformities, or lesions detected in the bones. This term is often used in ...Overview. The chest wall is comprised of skin, fat, muscles, and the thoracic skeleton. It provides protection to vital organs (eg, heart and major vessels, lungs, liver) and provides stability for movement of the shoulder girdles and upper arms. Although the thoracic skeleton consists of rigid bones and cartilage, its interconnection with the ...

Aug 1, 2018 · The last potential broad category that I will highlight as a potential avenue for suspicious densities on the lungs that doctors need to consider when a patient presents with a strange chest X-ray would be some type of lung parenchymal disease. Before I lose you, the parenchyma of the lungs is the surface tissue. The chest (thoracic) cavity is the area surrounded by the thoracic vertebrae, the ribs, the sternum, and the diaphragm. The lungs are housed in the chest cavity, a space that also includes the mediastinum. (See also Overview of the Respiratory System.). The mediastinum is in the center of the chest and contains the heart, thymus, and lymph nodes, along with portions of the aorta, vena cava ...Nodular opacification is one of the broad patterns of pulmonary opacification that can be described on a chest radiograph or chest CT.The others, linear opacification and airway opacification are discussed separately. Nodular opacification in the lung may be a. pulmonary nodule; airspace nodule; part of an underlying reticulonodular pattern.; …osseous: [ os´e-us ] of the nature or quality of bone; bony.Pulmonary edema. The function of the alveoli also depends on the sacs being inflated the right amount. Some conditions and injuries can cause overdistention or surfactant dysfunction, which cause the alveoli to collapse. This makes it harder for the lungs to work. Overdistention is overstretching of the alveoli.Apr 27, 2022 · Sometimes, bone metastasis causes no signs and symptoms. When it does occur, signs and symptoms of bone metastasis include: Bone pain. Broken bones. Urinary incontinence. Bowel incontinence. Weakness in the legs or arms. High levels of calcium in the blood (hypercalcemia), which can cause nausea, vomiting, constipation and confusion. Nodular opacification is one of the broad patterns of pulmonary opacification that can be described on a chest radiograph or chest CT.The others, linear opacification and airway opacification are discussed separately. Nodular opacification in the lung may be a. pulmonary nodule; airspace nodule; part of an underlying reticulonodular pattern.; …We would like to show you a description here but the site won’t allow us.Abstract. The concept that the small airway is a primary pathological site for all COPD phenotypes has been challenged by recent findings that the disease starts from the central airways in COPD subgroups and that a smaller central airway tree increases COPD risk. This study aimed to examine whether the computed tomography (CT)-based …

These could also represent bone lesions (the report says opacities superimposed over osseous structures) and not necessarily a lung pathology. Therefore, an apical view of the chest has been suggested to ensure whether the opacities in your chest x-ray are a true pathology of either lungs or bones or are just artefactual.

A bronchial tree (or respiratory tree) is the collective term used for these multiple-branched bronchi. The main function of the bronchi, like other conducting zone structures, is to provide a passageway for air to move into and out of each lung. In addition, the mucous membrane traps debris and pathogens. Why did my radiologist write this? findings: the lungs and pleural spaces are clear. the cardiac silhouette is normal. the regional osseous structures are normal. impression: no active cardiopulmonary process? Tissue that gives strength and structure to bones. Bone is made up of compact tissue (the hard, outer layer) and cancellous tissue (the spongy, ...The skeletal system consists of two major divisions: the axial skeleton and the appendicular skeleton.The axial skeleton includes the bones of the skull (cranial bones and facial bones), the vertebra l column, the hyoid bone, the sternum, and the ribs.The appendicular skeleton consists of the bones of the upper limbs, the lower limbs, the pectoral girdle, and the pelvic girdle.Bone, or osseous tissue, is a hard, dense connective tissue that forms most of the adult skeleton, the support structure of the body.In the areas of the skeleton where bones move (for example, the ribcage and joints), cartilage, a semi-rigid form of connective tissue, provides flexibility and smooth surfaces for movement.The skeletal system is the body system composed of bones and cartilage ...Sarcoidosis is a systemic multisystem inflammatory disease of unknown etiology. The disease is characterized by formation of non-caseating granulomas. The most common presentation is bilateral hilar lymphadenopathy and lung infiltration, but the disease is very heterogeneous, with an unpredictable clinical course.The osseous portion refers to the third of the Eustachian tube nearest to the middle ear. It can be variably surrounded by peritubal air cells. Along the roof of the osseous part of the Eustachian tube is a canal containing the tensor tympani muscle. The distal end of the osseous portion is formed by the petrous part of the temporal bone. Bone, or osseous tissue, is a hard, dense connective tissue that forms most of the adult skeleton, the support structure of the body.In the areas of the skeleton where bones move (for example, the ribcage and joints), cartilage, a semi-rigid form of connective tissue, provides flexibility and smooth surfaces for movement.

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Dec 14, 2018 · The lungs begin at the bottom of your trachea (windpipe). The trachea is a tube that carries the air in and out of your lungs. Each lung has a tube called a bronchus that connects to the trachea ... Introduction: Pulmonary ossification (PO) is a rare pathologic finding, defined as a widespread heterotopic bone formation within the lungs. PO occurs in two forms. The first form is the nodular circumscribed type; the second form is the racemose or branching type. Males are more often affected than females.By the time people are born, erythropoiesis takes place in people's bone marrow. Bone marrow is the spongy tissue inside of your bones. Fetal erythropoiesis. The location of erythropoiesis changes as a fetus develops during pregnancy. Week three: Erythropoiesis begins in the yolk sac. A yolk sac is a structure that nourishes a developing embryo.Lung Involvement in Scleroderma. The lungs are involved in around 80% of all patients with scleroderma. Lung involvement in all its forms has emerged to be the leading cause of death and disability. Because of this fact alone, understanding the type of lung involvement and its level of activity and severity forms the central information about ...The lung parenchyma is supplied by the bronchial arteries and veins, as well as the pulmonary nervous plexus. [Lungs in situ (anterior view)] The anatomical structure of the lung and air passageways can be quite complex, so we have provided you with additional resources below to help clear up any confusion.The base of the lungs is concave to follow the contour of the diaphragm. The left lung is slightly smaller than the right lung because 2/3 of the heart is located on the left side of the body. The left lung contains the cardiac notch, an indentation in the lung that surrounds the apex of the heart.Bone, or osseous tissue, is a hardened connective tissue that forms most of the adult skeleton, the support structure of the body.In the areas of the skeleton where bones move (for example, the ribcage and joints), cartilage, a semi-rigid form of connective tissue, provides flexibility and smooth surfaces for movement.The skeletal system is the body system composed of bones and cartilage and ...Bone, or osseous tissue, is a hard, dense connective tissue that forms most of the adult skeleton, the support structure of the body. In the areas of the skeleton where bones move (for example, the ribcage and joints), cartilage, a semi-rigid form of connective tissue, provides flexibility and smooth surfaces for movement. Lungs and Pleura: Lungs are clear. No pneumothorax or pleural effusion. Heart and Mediastinum: Cardiomediastinal silhouette is within normal limits. Bones: Visualized osseous structures are unremarkable. Impression The opacity of the right upper lobe has a homogeneous internal structure. The minor fissure and the hilum are displaced superiorly, which points to a volume loss. The upper lobe bronchus is obstructed and a postobstructive atelectasis has developed. The air in the alveoli and the bronchi has been absorbed. Pneumonia. ….

Multilevel degenerative disc disease is a condition characterized by the degeneration of intervertebral discs, impacting osseous structures and leading to changes in the spine. The degeneration often occurs in the lumbosacral region, resulting in the deterioration of the intervertebral discs. Moderate degenerative disc disease is marked by the ...Please read the disclaimer. Hypermetabolic on PET scan means that the tissue lights up or is hotter because it is more active than the background tissues. PET scans most commonly use a glucose molecule attached to a radioactive molecule which is then distributed throughout the body. Cells which use more glucose are called …Summary. When you lose bone minerals quicker than you can replace them, it's called bone demineralization. This can lead to other health conditions, including osteoporosis. About 60% of your ...Simple pulmonary eosinophilia is inflammation of the lungs from an increase in eosinophils, a type of white blood cell. Pulmonary means related to the lungs. Simple pulmonary eosin...A major organ of the respiratory system, each lung houses structures of both the conducting and respiratory zones. The main function of the lungs is to perform the …Osseous tissue is the structure providing, hard and mineralized connective tissues. Osseous tissue is also called bone tissue. Bone tissue forms the skeletal system structure of the body in most vertebrates. Structurally, the matrix of the osseous tissue is honeycomb-like to provide rigidity to the structure.A chest x-ray produces images of the heart, lungs, airways, blood vessels and the bones of the spine and chest. An x-ray exam helps doctors diagnose and treat medical conditions. It exposes you to a small dose of ionizing radiation to produce pictures of the inside of the body. X-rays are the oldest and most often used form of medical imaging.Nov 26, 2023 · The statement “soft tissues are unremarkable” in medical imaging reports denotes the absence of noticeable issues within these body structures. It serves as a reassuring indication, allowing doctors to focus on other conditions. Keep in mind that while this assessment is a valuable aspect of imaging reports, it’s always important to ... This small structure is cartilaginous early in life, but gradually becomes ossified starting during middle age. Ribs. Each rib is a curved, flattened bone that contributes to the wall of the thorax. The ribs articulate posteriorly with the T1–T12 thoracic vertebrae, and most attach anteriorly via their costal cartilages to the sternum.Why did my radiologist write this? findings: the lungs and pleural spaces are clear. the cardiac silhouette is normal. the regional osseous structures are normal. impression: no active cardiopulmonary process? 2 doctors weighed in across 2 answers. What is osseous structures in lungs, When bone forms, osteoblasts are trapped within it and become part of the framework. They are then called osteocytes and maintain the bone structure. Inside some of the bones of the body is a space that is filled with bone marrow. Blood cells are made in the bone marrow. All blood cells develop from stem cells which are found in the bone marrow., Major osseous defect, multiple sites. M89.79 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2024 edition of ICD-10-CM M89.79 became effective on October 1, 2023. This is the American ICD-10-CM version of M89.79 - other international versions of ICD-10 M89.79 may differ., The lungs are the largest organs of the respiratory tract. They are suspended within the pleural cavity of the thorax. In Figure \(\PageIndex{5}\), you can see that each of the two lungs is divided into sections. These are called lobes, and they are separated from each other by connective tissues. The right lung is larger and contains three lobes., When bone forms, osteoblasts are trapped within it and become part of the framework. They are then called osteocytes and maintain the bone structure. Inside some of the bones of the body is a space that is filled with bone marrow. Blood cells are made in the bone marrow. All blood cells develop from stem cells which are found in the bone marrow., a visceral serosa that covers the surface of each lung. Parietal pleura. the parietal pleura lines the walls of the thoracic cavity. the pleural membranes produce pleural fluid. fluid produced by the pleural membrane that allow the lungs to glide easily over the thorax wall during breathing movements and causes the pleural layer to cling together., This structure gives the skeletal muscle tissue four main physiological properties: ... Spongy (cancellous) bone is the deep airy layer of the bone. Unlike the compact bone, spongy bone is highly vascularized and more metabolically active. ... most importantly the brain, which is surrounded by the skull, as well as the heart and lungs, which ..., lung cancer; prostate cancer; When cancer starts in one place then spreads to bones, it's called metastatic bone cancer. ... Pain is caused by changes to the structure of the bones and ..., Acute processes such as herniated discs, discitis, osteomyelitis, and septic arthritis can also demonstrate focal FDG uptake and may be mistaken for osseous metastases [58, 59]. Focal FDG uptake in the muscles can be related to tendinous insertion, myositis, or intramuscular infection and mistaken for sites of malignancy [ 60 – 62 ]., The two types of bone tissue, also known as osseous tissue, are spongy and compact. Compact bone is dense, smooth and defines the exterior shapes of bones. Spongy bone has an asymm..., Summary. When you lose bone minerals quicker than you can replace them, it’s called bone demineralization. This can lead to other health conditions, including osteoporosis. About 60% of your ..., The lung roots, or hila (singular – hilum), are complicated anatomical structures containing the pulmonary vessels and the major bronchi, arranged asymmetrically. Although the hilar lymph nodes are not visible on a normal chest X-ray, they are of particular importance clinically. Often, hilar enlargement is due to enlargement of these nodes., name the 3 structures that make up the nasal septum. composed of the perpendicular plate of the ethmoid bone, the vomer, and the septal cartilage. what is the function of the respiratory epithelium & the venous plexuses in the nasal cavity? warms & moistens external air. from the nasal cavity, what is the name of the opening into the nasopharynx?, Gross Anatomy of Bones. A long bone has two main regions: the diaphysis and the epiphysis ( Figure 6.3.1). The diaphysis is the hollow, tubular shaft that runs between the proximal and distal ends of the bone. Inside the diaphysis is the medullary cavity, which is filled with yellow bone marrow in an adult., Gross Anatomy of Bone. The structure of a long bone allows for the best visualisation of all the parts of a bone (Figure 7.2.1). A long bone has two parts: the diaphysis and the epiphysis. The diaphysis is the tubular shaft that runs between the proximal and distal ends of the bone., Pulmonary ossification refers to bone tissue formation (calcification in a collagen matrix), with or without marrow elements, in the lung parenchyma. While other organs can be affected by ectopic calcification and ossification, the lungs are particularly susceptible [ 1 ]., Accordingly to the accredited clinic wherein last April 24,2018 I had my pre-employment examination. Type of Exam: CHEST PA interpretation: suspicious densities are seen in the right upper lung The heart is not enlarged. Hemidiaphragms, sinuses, soft tissues and visualized osseous structures are intact. Impression: Suspicious densities, …, The lungs have dual, parallel blood supply referred to as pulmonary and systemic circuits. The pulmonary circuit arises from the heart and brings deoxygenated blood to the lung for gas exchange. This circuit also takes oxygenated blood back to the heart to be redistributed to the rest of the body., Nodular opacification is one of the broad patterns of pulmonary opacification that can be described on a chest radiograph or chest CT.The others, linear opacification and airway opacification are discussed separately. Nodular opacification in the lung may be a. pulmonary nodule; airspace nodule; part of an underlying reticulonodular pattern.; Pulmonary nodules are situated in the pulmonary ..., Thoracic vertebrae. Anatomy, location and general features of the thoracic spine. The twelve thoracic vertebrae are strong bones that are located in the middle of the vertebral column, sandwhiched between the cervical ones above and the lumbar vertebrae below. Like typical vertebrae, they are separated by intervertebral discs., Osteoarthritis has often been referred to as a wear and tear disease. But besides the breakdown of cartilage, osteoarthritis affects the entire joint. It causes changes in the bone and deterioration of the connective tissues that hold the joint together and attach muscle to bone. It also causes inflammation of the joint lining., The respiratory system is the organs and other parts of your body involved in breathing, when you exchange oxygen and carbon dioxide. All the cells in your body need oxygen to work. As they take ..., The heart is located in the middle mediastinum. Other visible structures of the mediastinum should also be checked when viewing a chest X-ray. These include the aortic knuckle, descending aorta, aortopulmonary window, and right paratracheal stripe. Some structures of the mediastinum are not visible on a chest X-ray, for example the oesophagus ..., The systematic analysis of chest radiographic examinations involves the sequential assessment of various anatomic structures and interfaces and allows for a high level of confidence in the detection of abnormalities. The radiologist's detection, localization, and characterization of abnormal chest radiographic findings help guide the clinician to the appropriate follow-up imaging study or ..., Nose. The external nasal anatomy is quite simple. It is a pyramidal structure, with its root located superiorly and apex sitting inferiorly.The root is continuous with the anterior surface of the head and the part between the root and the apex is called the dorsum of the nose. Inferior to the apex are the two nares (), which are the openings to the nasal cavity., What is chronic osseous in my lungs mean. A member asked: ... the lungs and pleural spaces are clear. the cardiac silhouette is normal. the regional osseous structures are normal. impression: no active cardiopulmonary process? 2 doctors weighed in across 2 answers. A member asked:, The lungs (plural in Latin: pulmones, singular: pulmo) are the main respiratory organs located in the thorax. There are two lungs in the human body - right and left. They are expandable organs with a spongy structure that occupy most of the thoracic cavity and are situated on both sides of the mediastinum. The lungs are the central organs of ..., Chest X-rays produce images of your heart, lungs, blood vessels, airways, and the bones of your chest and spine. Chest X-rays can also reveal fluid in or around your lungs or air surrounding a lung., Figure 14.4.1 14.4. 1 :Roasted Bone Marrow. Bones are organs that consist primarily of bone tissue, also called osseous tissue. Bone tissue is a type of connective tissue consisting mainly of a collagen matrix that is mineralized with calcium and phosphorus crystals., Spine Structure and Function. Your spine is an important bone structure that supports your body and helps you walk, twist and move. Your spine is made up of vertebrae (bones), disks, joints, soft tissues, nerves and your spinal cord. Exercises can strengthen the core muscles that support your spine and prevent back injuries and pain., Lung Structure. The lungs are roughly cone shaped, with an apex, base, three surfaces and three borders. The left lung is slightly smaller than the right – this is due to the presence of the heart. Each lung consists of: Apex – The blunt superior end of the lung. It projects upwards, above the level of the 1st rib and into the floor of the ..., Bone tissue, or osseous tissue, is a hard, dense connective tissue that forms most of the adult skeleton, the internal support structure of the body. In the areas of the skeleton where whole bones move against each other (for example, joints like the shoulder or between the bones of the spine), cartilages, a semi-rigid form of connective tissue ..., Interstitial lung disease can be caused by long-term exposure to hazardous materials, such as asbestos. Some types of autoimmune diseases, such as rheumatoid arthritis, also can cause interstitial lung disease. In some cases, however, the causes remain unknown. Once lung scarring occurs, it's generally irreversible., The base of the lungs is concave to follow the contour of the diaphragm. The left lung is slightly smaller than the right lung because 2/3 of the heart is located on the left side of the body. The left lung contains the cardiac notch, an indentation in the lung that surrounds the apex of the heart.