Articles

Articles are a collaborative effort to provide a single canonical page on all topics relevant to the practice of radiology. As such, articles are written and edited by countless contributing members over a period of time. A global group of dedicated editors oversee accuracy, consulting with expert advisers, and constantly reviewing additions.

1,708 results found
Article

Aortic dissection detection risk score plus d-dimer

The use of the aortic dissection detection risk score plus d-dimer is a proposed standardized strategy of safely ruling out the diagnosis of an acute aortic syndrome. Similar to how the pulmonary embolism rule-out criteria (PERC) negates the need for further workup of a pulmonary embolism.  Int...
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Aortic hiatus

The aortic hiatus is one of the three major apertures through the diaphragm and lies at the level of T12. Strictly speaking, it is not a real aperture in the diaphragm, but an osseoaponeurotic opening between it and the vertebral column.  The hiatus is situated slightly to the left of the midli...
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Aortic intramural hematoma

Aortic intramural hematoma (IMH) is an atypical form of aortic dissection due to hemorrhage into the wall from the vasa vasorum without an intimal tear. It is part of the acute aortic syndrome spectrum. Epidemiology Typically aortic intramural hematomas are seen in older hypertensive patients....
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Aortic knob

The aortic knob or knuckle refers to the frontal chest x-ray appearance of the distal aortic arch as it curves posterolaterally to continue as the descending thoracic aorta. It appears as a laterally-projecting bulge, as the medial aspect of the aorta cannot be seen separate from the mediastinum...
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Aortic nipple

An aortic nipple is seen in about 10% of PA chest x-rays on the lateral surface of the aortic arch/aortic knob. It represents the left superior intercostal vein. When prominent, superior vena cava obstruction should be considered as the left superior intercostal vein serves as a collateral path...
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Aortic pseudoaneurysm versus ductus diverticulum

Differentiation of aortic pseudoaneurysm from ductus diverticulum is critical, particularly in the trauma setting. A traumatic aortic pseudoaneurysm is a surgical emergency whereas a ductus diverticulum is a normal anatomic variant. The following are differentiating features: Aortic pseudoaneu...
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Aortic-pulmonary stripe

The aortic-pulmonary stripe is an uncommon feature of frontal chest radiographs and was first described by Keats in 1972 1. It is formed by the interface of the pleural surface of the anterior segment of the left upper lobe contacting the mediastinal fat that is anterolateral to the pulmonary t...
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Aortic transection

An aortic transection, also known as a traumatic aortic rupture, is a type of traumatic aortic injury. It is considered the second most common cause of death associated with motor vehicle accidents. Pathology It occurs from a near-complete tear through "all the layers" of the aorta due to trau...
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Aortic valve calcification

Aortic valve calcification can be an important incidental observation thoracic radiography or CT imaging. It is considered a marker for clinically significant aortic stenosis. Prevalance According to some reports aortic valve calcification may be prevalent as an incidental finding up to 18% of...
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Aortopulmonary septal defect

Aortopulmonary septal defect (APSD), also known as aortopulmonary window (APW), is a congenital anomaly where there is an abnormal communication between the proximal aorta and the pulmonary trunk in the presence of separate aortic and pulmonary valves. Terminology APSD should not be confused w...
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Aortopulmonary window (radiograph)

The aortopulmonary (aortic-pulmonary or AP) window (also known as APW, but see 'Terminology' below) is a radiological mediastinal space seen on frontal chest radiographs. Terminology The term should also not be confused with an aortopulmonary septal defect, which is occasionally also called an...
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Apical lung diseases (mnemonic)

Handy mnemonics to remember common apical lung diseases are: SET CARP CARPETS (anagram of SET CARP) Mnemonics S: sarcoidosis E: eosinophilic pneumonia T: tuberculosis C: cystic fibrosis A: ankylosing spondylitis R: radiation pneumonitis P: pneumoconiosis
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Apical pleural cap

Apical pleural cap refers to a curved density at the lung apex seen on chest radiograph. Epidemiology The frequency of apical pleural thickening increases with age 3. Pathology It arises from a number of causes: pleural thickening/scarring idiopathic: chronic ischemic etiology is favored f...
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Apical zone

The apical zone is one of the four chest radiograph zones and an important location for missed diagnoses when reporting a frontal chest radiograph and makes up one of the "check areas". It is sometimes thought of as a subdivision of the upper zone.  Radiographic features Plain radiograph port...
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Asbestos

Asbestos is a set of six naturally occurring silicate minerals from mixture of calcium magnesium, iron, and sodium exploited commercially for their desirable physical properties, particularly their resistance to heat and burning. They all form thin elongated fibrous crystals, and can be manufact...
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Asbestos body

An asbestos body is a histological finding in interstitial lung disease that is suggestive of significant occupational asbestos exposure. They are usually identified following a parenchymal lung biopsy 3. Macrophage ingestion of the asbestos fibers triggers a fibrogenic response via the release...
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Asbestosis

Asbestosis refers to later development of diffuse interstitial fibrosis secondary to asbestos fiber inhalation and should not be confused with other asbestos related diseases. Epidemiology Asbestosis typically occurs 10-15 years following the commencement of exposure to asbestos and is dose re...
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Asbestos related benign pleural disease

Asbestos related benign pleural disease forms a large part of asbestos related lung changes. The spectrum comprises of: pleural effusions: benign-asbestos induced pleural effusions can be associated with functional impairment usually occur within 10 years of exposure but can also develop muc...
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Asbestos-related diseases

Asbestos-related disease, in particular affecting the lung, comprise of a broad spectrum of entities related to the inhalational exposure to asbestos fibers. They can be divided into benign and malignant changes 1-3. Benign pleural and parenchymal lung disease asbestos related benign pleural d...
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Ascariasis

Ascariasis is due to infection with the Ascaris lumbricoides adult worm and typically presents with gastrointestinal or pulmonary symptoms, depending on the stage of development.   Epidemiology Ascaris lumbricoides is widely distributed in tropical and subtropical regions and in other humid ar...
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Ascending aorta dilatation

Dilatation of the ascending aorta is a common finding in the elderly but unusual in younger patients. Pathology In adults, an ascending aortic diameter greater than 4 cm is considered to indicate dilatation 4. Aneurysmal dilatation is considered when the ascending aortic diameter reaches or ex...
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Ascending aortic aneurysm

Ascending aortic aneurysms are the most common subtype of thoracic aortic aneurysms and may be true or false injuries.  Epidemiology Ascending aortic aneurysms represent 60% of thoracic aortic aneurysms.  Clinical presentation Typically ascending aortic aneurysms are an incidental finding an...
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Ascending cervical artery

The ascending cervical artery is 1 of the 4 branches of the thyrocervical trunk (off the first part of the subclavian artery). It is a small artery that ascends medial to the phrenic nerve on the prevertebral fascia. It contributes many small spinal branches into the intervertebral foramina of ...
Article

Askin tumor

The original description of the Askin tumor (by Askin and Rosai in 1979 1), and many studies following it have led to a great deal of confusion. Until recently it has been considered a separate entity or as a type of peripheral primitive neuroectodermal tumor, usually of the chest wall. However...
Article

Aspergilloma

Aspergillomas are mass-like fungus balls that are typically composed of Aspergillus fumigatus and are a non-invasive form of pulmonary aspergillosis. It usually falls under the subgroup chronic pulmonary aspergillosis. Terminology Although the term mycetoma is frequently used to describe these...
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Aspergillus

Aspergillus is a fungal genus consisting of approximately 180 species. It is a ubiquitous fungus frequently found in urban areas especially in decomposing organic matter or water damaged walls and ceilings. Only a few Aspergillus species are associated with human disease.  Aspergillus species ...
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Aspergillus clavatus

Aspergillus clavatus is one of the species of Aspergillus that can cause pathology in humans. It is allergenic and causes a hypersensitivity pneumonitis called malt-workers lung. See also Aspergillus Aspergillus fumigatus Aspergillus flavus Aspergillus clavatus
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Aspergillus flavus

Aspergillus flavus is a fungus and one of the species of Aspergillus that is common in the environment and responsible for pathology in humans. It is the second most common cause of pulmonary aspergillosis (after Aspergillus fumigatus) and can additionally cause corneal, otomycotic, and nasoorb...
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Aspergillus fumigatus

Aspergillus fumigatus is a fungus of the genus Aspergillus, and is one of the most common Aspergillus species to cause disease in immuno-compromised individuals. A. fumigatus is a saprotroph (an organism that gets its energy from non-living organic matter) that is widespread in nature, typicall...
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Asphyxiating thoracic dysplasia

Asphyxiating thoracic dysplasia, also known as Jeune syndrome, is a type of rare short limb skeletal dysplasia, which is primarily characterized by a constricted long narrow thoracic cavity, cystic renal dysplasia and characteristic skeletal features. It is also sometimes classified as one of th...
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Aspiration

Aspiration occurs if liquid or solid material enters the subglottic lower respiratory tract. Terminology The term aspiration is used if material passes below the level of the vocal folds, i.e. subglottic. If material enters the larynx but remains above the vocal folds this is called penetratio...
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Aspiration bronchiolitis

Aspiration bronchiolitis, or diffuse aspiration bronchiolitis, is a condition characterized by a chronic inflammation of bronchioles caused by recurrent aspiration of foreign particles. Epidemiology Associations neurologic disorders: ~ 50% 3 dementia: ~50% 3 Risk factors Patients with esop...
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Aspiration pneumonia

Aspiration pneumonia is caused by a direct chemical insult due to the entry of a foreign substance, solid or liquid, into the respiratory tract. Clinical presentation Aspiration may be clinically silent, or it may present with dyspnea, cough, or fever. The clinical and radiographic features de...
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Assessment of bones and soft tissue on chest x-ray

Described below are points to consider on assessment of bones and soft tissue on chest x-ray.  ribs rib fractures lesions (most commonly metastases): may appear as lucent and/or sclerotic; inverting contrast may help in identification previous surgery, e.g. thoracotomy with rib resection ve...
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Assessment of cardiomediastinal contours on chest x-ray (approach)

Described below is one approach to systematic assessment and associated pathology of the cardiomediastinal contours on chest x-ray. Mediastinum size: widened mediastinum can be seen in aortic dissection, traumatic aortic injuries abnormal contour, e.g. lymphadenopathy, anterior mediastinal m...
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Assessment of chest x-ray technical adequacy (approach)

Described below are some points on an approach to the assessment of the chest x-ray technical adequacy. Rarely, a technically inadequate chest x-ray will prohibit diagnostic interpretation but knowledge of the limitations will impact on diagnostic confidence.  Inspiratory effort anterior aspec...
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Assessment of lungs, pleura and airways on chest x-ray (approach)

Described below is one approach to the assessment of airways, lungs and pleura on chest x-ray. Start by assessing the tracheal air column, followed by the lungs and finally the pleural spaces.  Tracheobronchial tree assess position, should be central and deviation can be due to positive mass ...
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Assessment of pulmonary hila on chest x-ray (approach)

Described here are points to consider when approaching the assessment of the pulmonary hila on chest x-ray: shape normally appear as gentle C-shapes on either side contents: pulmonary arteries and veins, bronchi, lymph nodes position left hilum is normally 1-2 cm higher than the right low ...
Article

Asthma

Asthma is a relatively common condition that is characterized by at least partially reversible inflammation of the airways and reversible airway obstruction due to airway hyperreactivity. It can be acute, subacute or chronic. Epidemiology Asthma is one of the most common chronic diseases in th...
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Asthma (summary)

This is a basic article for medical students and other non-radiologists Asthma is a heterogeneous disease, usually characterized by chronic airway inflammation and airway hyperreactivity. It is defined by two main features 1: a history of respiratory symptoms such as wheeze, shortness of breat...
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Asthmatic pulmonary eosinophilia

Asthmatic pulmonary eosinophilia is a form of pulmonary eosinophilia which is commonly attributed to Aspergillus fumigatus. Although many cases have not shown any allergen. Radiographic features Plain radiograph - patterns normal hyperinflation (in acute attacks or chronic severe asthma) fe...
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Atelectasis (summary)

This is a basic article for medical students and other non-radiologists Atelectasis describes loss of lung volume secondary to collapse. It has many causes, the root of which is bronchial obstruction with absorption of distal gas. Atelectasis may be subsegmental, segmental, lobar, or involve th...
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Atoll sign (disambiguation)

The atoll sign in radiology can refer to: reverse halo sign: atoll sign in thoracic CT atoll sign in liver MRI: suggestive of an inflammatory hepatic adenoma
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Atresia

Atresia refers to a situation where there is underdevelopment of a structure with very rudimentary remnant tissues. This contrasts with agenesis, in which there is no development of the structure at all. The term atresia is often used with hollow structures such as a bronchus or intestine.  For...
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Atrial-esophageal fistula

Atrio-esophageal fistulas are rare pathological connections between the left atrium and the esophagus.  Clinical presentation The presentation is non-specific. Patients may complain of fever, malaise, and/or dysphagia, or present with neurological symptoms 3.  Pathology The chief cause of at...
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Atypical adenomatous hyperplasia of the lung

Atypical adenomatous hyperplasia (AAH) of the lung is a putative precursor lesion of adenocarcinoma of the lung. This entity replaces part of a spectrum of the former bronchoalveolar carcinoma (BAC). Pathology AAHs are represented by localized small cell proliferation, usually measuring ≤0.5 c...
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Atypical pneumonia

Atypical pneumonia refers to the radiological pattern associated with patchy inflammatory changes, often confined to the pulmonary interstitium, most commonly associated with atypical bacterial etiologies such as Mycoplasma pneumoniae, Chlamydophila pneumoniae and Legionella pneumophilia. Viral ...
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Atypical pulmonary carcinoid tumor

An atypical pulmonary carcinoid tumor is a more aggressive variant of a peripheral pulmonary carcinoid tumor. They are considered intermediate grade neoplasms and  have the same “carcinoid morphology,” but with mitotic rates increased (at 2–10 mitoses per 2 mm2) where the tumor might also be pun...
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Atypical ribs

Owing to their features, the first, eleventh and twelfth ribs are considered atypical ribs. Of all ribs, the first is the strongest, broadest and most curved. Ribs eleven and twelve are unique, among other reasons, by not being attached to the sternum.
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Azygo-esophageal recess

The azygo-esophageal recess (also known as the line/interface) (AER) is a prevertebral space formed by the interface of the posteromedial segments of the right lower lobe and the azygos vein and esophagus 1-3. The AER extends from the azygos arch to the aortic hiatus and has the following border...
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Azygo-esophageal recess deviation

The azygoesophageal recess (AER) is formed by the interface between the right lung and the mediastinal reflection of the azygos vein and oesphagus. The line has a variable appearance: in its upper third, it deviates to the right, where it may either be straight or concave relative to the right ...
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Azygos lobe

An azygos lobe is created when a laterally displaced azygos vein creates a deep pleural fissure into the apical segment of the right upper lobe during embryological development. It is a normal anatomic variant of the right upper lobe due to invagination of the azygos vein and pleura during devel...
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Azygos vein

The azygos vein is a unilateral vessel that ascends in the thorax to the right side of the vertebral column, carrying deoxygenated blood from the posterior chest and abdominal walls. It forms part of the azygos venous system. Terminology Spelling it "azygous" when referring to the vein is inco...
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Azygos venous system

The azygos (venous) system is a collective term given to the H-shaped configuration of the azygos, hemiazygos, accessory hemiazygos veins and left superior intercostal vein. It is responsible for draining the thoracic wall and upper lumbar region via the lumbar veins and posterior intercostal v...
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Bacillary angiomatosis

Bacillary angiomatosis is an infective complication in those with the acquired immunodeficiency syndrome (AIDS) 3. Amongst other widespread multi-organ manifestations, the infection causes skin lesions which can be similar to those of Kaposi sarcoma. Pathology Characterized by a non-neoplastic...
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Bacterial tracheitis

Exudative tracheitis, also known as bacterial tracheitis, membranous croup or membranous laryngotracheobronchitis, is a rare, but potentially life-threatening cause of upper airway obstruction. Epidemiology Typical age ranges from 6 to 10 years of age. Clinical presentation Clinically it pre...
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Bagassosis

Bagassosis refers to a form of hypersensitivity pneumonitis related to a mouldy molasse usually related to sugar cane called bagasse (Thermoactinomyces sacchari). It is considered to reflect a reaction or organic dust. It is considered rare especially in recent years.
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Ball of wool sign (hydatid cyst)

The ball of wool sign, also referred to as the yarn sign or congealed water lily sign, is an ultrasound appearance, representing degeneration of hydatid cysts (WHO class CE 4). The inner side of the cyst detaches from the cyst wall and folds on itself, causing a change from anechoic (fluid) to a...
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BALT lymphoma

BALT lymphoma is an abbreviated term for bronchus-associated lymphoid tissue lymphoma. These neoplasms fall under the broader umbrella of mucosa associated lymphoid tissue (MALT) lymphomas. It is sometimes considered a type of primary pulmonary lymphoma. Clinical presentation Up to half of pat...
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Barium aspiration

Barium aspiration occurs occasionally during upper GI fluoroscopic studies using barium sulfate contrast, and usually only small amounts pass into the airways. Clinical presentation When only tiny quantities of barium pass into the airways (so-called microaspiration) the patient may remain asy...
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Barium sulfate contrast medium

Barium sulfate (BaSO4), often just called barium in radiology parlance, is an ionic salt of barium (Ba), a metallic chemical element with atomic number 56. Barium sulfate forms the basis for a range of contrast media used in fluoroscopic examinations of the gastrointestinal tract. Unlike barium ...
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Bat wing opacities (lungs)

Bat wing or butterfly pulmonary opacities refer to a pattern of bilateral perihilar shadowing. It is classically described on a frontal chest radiograph but can also refer to appearances on chest CT 3,4. Differential diagnosis Bat wing pulmonary opacities can be caused by: pulmonary edema (es...
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BCGosis

BCGosis is a rare granulomatous disease following intravesical Bacillus Calmette-Guerin immunotherapy used in the treatment of superficial transitional cell carcinoma of the urinary bladder. It manifests as a miliary pattern best seen in the lungs. 
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Bedside lung ultrasound in emergency (approach)

Bedside lung ultrasound in emergency (BLUE) is a basic point-of-care ultrasound (POCUS) examination performed for undifferentiated respiratory failure at the bedside, immediately after the physical examination, and before echocardiography. The protocol is simple and dichotomous, and takes fewer...
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Behçet disease

Behçet disease is a multisystemic and chronic inflammatory vasculitis of unknown etiology. Epidemiology The mean age at which Behçet disease occurs is 20-30 years. The disease is most prevalent in the Mediterranean region, Middle East and East Asia. The highest incidence has been reported in T...
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Behçet disease (thoracic manifestations)

Thoracic manifestations in Behçet disease have a wide spectrum of appearances.  Epidemiology The reported prevalence of thoracic involvement of Behçet disease is thought to range around 1-8% 2. Radiographic features CT Chest HRCT can demonstrate the entire spectrum of thoracic manifestation...
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Benign asbestos-induced pleural effusions

Benign asbestos-induced pleural effusions are considered part of asbestos related benign pleural disease. Clinical presentation Patients may be asymptomatic or present with dyspnea or chest pain. Pathology They develop after an extended latency period post-asbestos exposure, with a median du...
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Benign metastasizing leiomyoma

Benign metastasizing leiomyomas (or leiomyomata) are a rare non-malignant metastatic phenomenon that may be observed with a pelvic leiomyoma. Epidemiology Women who have undergone hysterectomy for leiomyomas are most commonly affected. Clinical presentation Patients are usually asymptomatic ...
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Benjamin Felson

Benjamin "Benny" Felson (1913-1988) was a renowned Cincinnati chest radiologist who coined or popularized several of the most commonly-used terms in the everyday parlance of the English-speaking radiology community.   Early life Benjamin Felson was born in Newport, Kentucky on 21st October 191...
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Beryllium

Beryllium (chemical symbol Be) is an alkaline earth metallic element, that has no known function in any organism. Unfortunately beryllium is very poisonous, manifesting as chronic beryllium lung disease, which causes premature mortality in one third 1. Chemistry Basic chemistry Beryllium is a...
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Beryllium sensitization

Beryllium sensitization (BeS) is a process whereby individuals exposed to beryllium dust develop a hypersensitivity reaction to it. A sizeable proportion of these individuals can progress to chronic beryllium lung disease with ongoing exposure.
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Bifid rib

Bifid or forked or bifurcated rib is a congenital skeletal abnormality of the rib cage with the cleaved sternal end into two. They are thought to occur in ~0.2% of the population and there may be a female as well as right-sided predilection 2. Epidemiology Associations Bifid ribs can be seen ...
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Big rib sign

The big rib sign is a sign to differentiate right and left ribs on lateral chest radiographs.  It exploits a technique of magnification differences on lateral projections between right and left ribs. For example, on right lateral projections the left ribs appear larger than right ribs.  This s...
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Bilateral axillary lymphadenopathy (differential)

Bilateral axillary lymphadenopathy can result from a number of causes and generally implies a systemic process. They include: autoimmune diseases, e.g.: rheumatoid arthritis scleroderma dermatomyositis 5 systemic lupus erythematosus (SLE) psoriasis Sjögren syndrome lymphoma leukemia di...
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Bilateral hilar lymph node enlargement

Bilateral hilar lymph node enlargement can arise from many causes, which include: sarcoidosis infection tuberculosis mycoplasma histoplasmosis coccidioidomycosis malignancy lymphoma: more common in Hodgkin lymphoma than non-Hodgkin lymphoma. carcinoma inorganic dust disease silicosis ...
Article

Bird fancier lung

Bird fancier lung refers to a type of hypersensitivity pneumonitis occurring as a response to avian antigens (usually inhaled proteins in the dust of bird feathers and droppings). It can have acute, subacute and chronic clinical presentations. For a broad discussion on this entity, please refer...
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Birt-Hogg-Dubé syndrome

Birt-Hogg-Dubé syndrome or folliculin gene-associated syndrome is a genetic multisystemic disease mainly characterized by: multiple lung cysts and secondary spontaneous pneumothoraces multiple bilateral renal tumors (particularly chromophobe renal cell cancer and oncocytoma) cutaneous manifes...
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Black pleura sign (lungs)

The black pleura sign is a feature described in pulmonary alveolar microlithiasis. It is seen as a strip of tangential peripheral lucency underlying the ribs as compared to the adjacent diffusely dense calcified lung. Although termed black pleura, it actually represents subpleural sparing of pu...
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Bleomycin lung toxicity

Bleomycin lung toxicity is an uncommon but recognized complication that can occur with the chemotherapeutic drug bleomycin. Pathology Bleomycin Bleomycin is an antitumour antibiotic which was initially isolated from a strain of Streptomyces verticillus in 1966. It is commonly used (either alo...
Article

B-line (ultrasound)

The B-line is an artifact relevant in lung ultrasonography. As originally described, it has seven defining features 1: a hydroaeric comet-tail artifact arising from the pleural line hyperechoic well-defined extending indefinitely erasing A-lines  moving in concert with lung sliding, if lung...
Article

Bochdalek hernia

A Bochdalek hernia (plural: hernias or herniae) is a form of congenital diaphragmatic hernia. They occur posteriorly and are due to a defect in the posterior attachment of the diaphragm when there is a failure of pleuroperitoneal membrane closure in utero. Retroperitoneal structures may prolapse...
Article

Bochdalek hernia features (mnemonic)

A helpful mnemonic for remembering the features of a Bochdalek hernia is: 5 Bs Mnemonic B: Bochdalek B: big B: back and lateral, usually on the left side B: baby B: bad (associated with pulmonary hypoplasia) To remember the side in which a Bochdalek hernia more commonly occurs (and to co...
Article

Body imaging

Body imaging is the term assigned to cross-sectional imaging of the body, which radiologically refers to the chest, abdomen and pelvis. It is often used by radiologists who report this region (sometimes known as body imagers/radiologists) to differentiate their primary area of interest from othe...
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Bornholm disease

Bornholm disease, also known as epidemic pleurodynia, is a virally-mediated myositis presenting as recurrent episodes of acute severe pleuritic pain. It is usually self-limiting, and serious morbidity is rare. Epidemiology Its true incidence is unknown and it is thought that it is underdiagnos...
Article

Bovine arch

Bovine arch is the most common variant of the aortic arch and occurs when the brachiocephalic (innominate) artery shares a common origin with the left common carotid artery.  A bovine arch is apparent in ~15% (range 8-25%) of the population and is more common in individuals of African descent. ...
Article

Box-shaped heart

A box-shaped heart is a radiographic description given to the cardiac silhouette in some cases of Ebstein anomaly. The classic appearance of this finding is caused by the combination of the following features: huge right atrium that may fill the entire right hemithorax shelved appearance of th...
Article

Boyden classification of bronchi

The Boyden classification of bronchi refers to the standard nomenclature used to describe bronchopulmonary segmental anatomy. Each lung has 10 segments, however on the left, the first two segments share a common trunk and are hence B1/2. Also given the shared trunk on the left of the lower lobe...
Article

Brachiocephalic trunk

The brachiocephalic trunk (BCT) (also known as the brachiocephalic artery, and previously as the innominate artery) is a major vessel that supplies the head, neck and right arm. Gross anatomy The brachiocephalic trunk is the first of the three main branches of the aortic arch, which originates...
Article

Brachiocephalic vein

The brachiocephalic veins, previously known as the innominate veins, are large paired valveless asymmetric veins that drain the head, neck, upper limbs and part of the thorax and mediastinum. Gross anatomy Origin In the root of the neck, the internal jugular (IJV) and subclavian veins unite t...
Article

Brachytherapy seed migration to the lung

Brachytherapy seed migration to the lung is a known complication of radioactive seed therapy. These seeds are used for localized treatment of malignancies, most commonly prostate cancer. Regarding staging, nearly 79% of the cases are localized, 12% are regional and 5% present with distant disea...
Article

Branches of the thoracoacromial artery (mnemonic)

Useful mnemonics to remember the four branches of the thoracoacromial artery are: ABCD CAlifornia Police Department Cadavers Are Dead People PACkeD Mnemonics ABCD A: acromial B: breast (pectoral) C: clavicular D: deltoid CAlifornia Police Department C: clavicular A: acromial  P: pe...
Article

Brasfield scoring system

The Brasfield scoring system is a scoring system for patients with cystic fibrosis. The score is based on conventional chest radiographic findings and has been reported to have good correlation with pulmonary function. There can be intra- and interobserver variability between radiologists. Ther...
Article

Bridging bronchus

A bridging bronchus is a rare congenital bronchial anomaly where there is an anomalous bronchus to the right lung arising from the left main bronchus. It has a high association with right upper lobe bronchus (pig bronchus) and congenital cardiac and vascular malformations, particularly a left pu...

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