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 continuously improved upon by countless contributing members. Our dedicated editors oversee each edit for accuracy and style. Find out more about articles.
16,824 results found
Article
Hypodontia
Hypodontia, also known as oligodontia or adontia, refers to the developmental failure of one or more teeth, excluding the third molars.
Terminology
The phenomenon of non-development of teeth has been described using several terms including 'hypodontia', 'oligodontia' and 'adontia'. The descrip...
Article
Radial bands sign (tuberous sclerosis)
The radial bands sign, also known as radial migration bands, refers to linear bands seen on MRI, radiating from the periventricular white matter to the subcortical region, thought to be specific for tuberous sclerosis 1,2.
Pathology
The exact pathogenesis of radial bands is uncertain, but they...
Article
Chronic hypersensitivity pneumonitis (historical)
Chronic hypersensitivity pneumonitis is a legacy term not recommended in the most recent guidelines (c. 2020) 12. In chronic hypersensitivity pneumonitis, there is radiological evidence of fibrosis which represents the end-stage of repeated or persistent pneumonitis 7. Most of the manifestations...
Article
Upper lobe bronchiectasis
Distribution of bronchiectasis can help in narrowing the differential diagnosis. Upper lobe bronchiectasis is typically seen in:
cystic fibrosis
tuberculosis
Rarely it may be seen with non-tuberculous mycobacterial infection (e.g. MAC infection 2). Traction bronchiectasis in the upper lobes c...
Article
Lymphomatoid granulomatosis
Lymphomatoid granulomatosis, also known as angiocentric lymphoma or angiocentric immunoproliferative lesion, is a rare type of non-Hodgkin lymphoma associated with Epstein-Barr virus infection.
Pathology
There is a recognized association with antecedent infection with the Epstein-Barr virus (...
Article
Lymphomatoid granulomatosis (pulmonary manifestations)
Pulmonary manifestations of lymphomatoid granulomatosis are important since the lung is one of the most frequent sites of involvement in lymphomatoid granulomatosis. It falls under the group of pulmonary angiitis and granulomatosis.
Pathology
Some consider the condition to be midway between ov...
Article
Medical abbreviations and acronyms (L)
This article contains a list of commonly used medical abbreviations and acronyms that start with the letter L and may be encountered in medicine and radiology (please keep the main list and any sublists in alphabetic order).
A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R ...
Article
Medical abbreviations and acronyms (R)
This article contains a list of commonly used medical abbreviations and acronyms that start with the letter R and may be encountered in medicine and radiology (please keep the main list and any sublists in alphabetic order).
A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R ...
Article
Iliohypogastric nerve
The iliohypogastric nerve arises from the anterior ramus of the L1 nerve root of the lumbar plexus along with the ilioinguinal nerve. It is a sensory nerve that provides lateral and anterior cutaneous branches supplying the posterolateral gluteal skin and skin in the pubic region.
Gross anatomy...
Article
Pituitary stone
Pituitary stones, also known as pituitary lithiases or pituitary calculi, are very rare types of brain stones characterized by extensive calcification in the sella turcica.
Terminology
Throughout the literature, there is contention and inconsistency regarding what pituitary stones actually are...
Article
Neurosyphilis
Neurosyphilis results from infection of the central nervous system by the spirochete Treponema pallidum, subspecies pallidum. The disease has a heterogeneous spectrum of early and late manifestations.
For a general discussion, and for links to other system-specific manifestations, please refer ...
Article
Gluteus medius muscle
The gluteus medius muscle and gluteus minimus muscle are two muscles of the more superficial group in the gluteal region.
Summary
origin: gluteal surface of the ilium between the posterior and anterior gluteal line, gluteal aponeurosis, and posteroinferior iliac crest 1-3
insertion: superopos...
Article
Kyphosis
Kyphosis (plural: kyphoses), much less commonly kyphus, is a term used to describe the sagittal curvature of the thoracic spine. Hyperkyphosis is when the kyphosis angle is above the normal range 5,7.
Pathology
Kyphosis increases with age, with a kyphosis angle of ~25° (range 20-29°) in adoles...
Article
Gluteal muscles
The superficial gluteal muscles lie within the gluteal region posterolateral to the bony pelvis and proximal femur. From superficial to deep lie the gluteus maximus, medius and minimus. The gluteus maximus is an important muscle for hip extension and lateral rotation. Gluteus medius and minimus ...
Article
Subacromial impingement
Subacromial impingement is the most common form of shoulder impingement and occurs secondary to attrition between the coracoacromial arch and the underlying supraspinatus tendon or subacromial bursa, leading to tendinopathy and bursitis respectively.
Pathology
Etiology
acromial shape
os acro...
Article
Charcot-Marie-Tooth disease
Charcot-Marie-Tooth (CMT) disease, also known as hereditary motor and sensory neuropathy (HMSN), refers to a heterogeneous group of inherited peripheral neuropathies rather than a single clinical entity 9.
Epidemiology
The prevalence of CMT in one Norwegian study was 82.3 cases per 100,000 peo...
Article
Saccular cerebral aneurysm
Saccular cerebral aneurysms, also known as berry aneurysms, are intracranial aneurysms with a characteristic rounded shape. They account for the vast majority of intracranial aneurysms and are the most common cause of non-traumatic subarachnoid hemorrhage.
Terminology
Those larger than 25 mm i...
Article
Extradural hemorrhage (summary)
This is a basic article for medical students and other non-radiologists
Extradural hemorrhages (EDH) represent collections of blood in the extradural (epidural) space. The hemorrhage sits between the skull superficially and the dura which overlies the brain parenchyma.
The bleed in relation to...
Article
Medical abbreviations and acronyms (E)
This article contains a list of commonly used medical abbreviations and acronyms that start with the letter E and may be encountered in medicine and radiology (please keep both the main list and any sublists in alphabetic order).
A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q...
Article
Perforated appendix
A perforated appendix is one of the complications of acute appendicitis. When appendicitis is left untreated, necrosis (gangrene) of the appendiceal wall can occur and progress to a focal rupture.
Epidemiology
The rate of perforated appendix vary from 16% to 40%, with higher incidence in young...