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.
More than 200 results
Article
In situ contouring
In situ contouring is a surgical technique used in thoracolumbar scoliosis surgery and thoracolumbar fracture reduction and fixation.
Procedure
Thoracolumbar scoliosis surgery
The key of this technique is to "make the rod take the shape of the spine and then to make the spine take the shape ...
Article
Coarctation of the aorta
Coarctation of the aorta (CoA) refers to a narrowing of the aortic lumen.
Epidemiology
Coarctations account for between 5-8% of all congenital heart defects. They are more frequent in males, M:F ratio of ~2-3:1.
Associations
As with many congenital abnormalities, coarctation of the aorta is ...
Article
Interrupted aortic arch
Interrupted aortic arch (IAA) is an uncommon congenital cardiovascular anomaly where there is a separation between the ascending and descending aorta. It can either be complete or connected by a remnant fibrous band. An accompanying large ventricular septal defect (VSD) and/or patent ductus arte...
Article
Extensor carpi ulnaris tendinopathy
Extensor carpi ulnaris (ECU) tendinopathy is varied and includes tendinosis, (stenosing) tenosynovitis, tendon instability, and (rarely) rupture.
Epidemiology
Athletes at increased risk of ECU tendinopathy include those who participate in 1,2:
racquet sports, e.g. tennis
club sports, e.g. g...
Article
Ulnar nerve dislocation (at elbow)
Ulnar nerve dislocation (or it if occurs to lesser degree ulnar nerve subluxation) at the elbow is an uncommon cause of pain and paresthesia in the ulnar nerve distribution. It occurs if the ulnar nerve subluxes and then dislocates over the anterior aspect of the medial epicondyle during flexion...
Article
Hepatic abscess
Hepatic abscesses, like abscesses elsewhere, are localized collections of necrotic inflammatory tissue caused by bacterial, parasitic, or fungal agents.
Epidemiology
The frequency of individual infective agents as causes of liver abscesses are intimately linked to the demographics of the affe...
Article
Scleritis
Scleritis refers to inflammation of the sclera. It has a wide range of causes.
Epidemiology
It can affect any age group but usually those between ages 30 and 50 years. There is a recognized increased female predilection (F:M of ~2:1).
Associations
Scleritis can be associated with systemic in...
Article
Cornuate navicular
A cornuate navicular (also termed a Geist type 3 accessory navicular) is considered a fused variant of accessory navicular bones.
Radiographic features
It may be seen as a prominent bony projection to the medial aspect of the navicular bone.
Plain radiograph
Seen as a prominent medial navicu...
Article
Accessory navicular
An accessory navicular is a large accessory ossicle that can be present adjacent to the medial side of the navicular bone. The tibialis posterior tendon often inserts with a broad attachment into the ossicle. Most cases are asymptomatic but in a small proportion, it may cause painful tendinosis ...
Article
Subarachnoid cisterns
The subarachnoid cisterns, or basal cisterns, are compartments within the subarachnoid space where the pia mater and arachnoid membrane are not in close approximation and cerebrospinal fluid (CSF) forms pools or cisterns (Latin: "box"). As they are interconnected, their patency is essential for ...
Article
Suprascapular neuropathy
Suprascapular neuropathy or suprascapular nerve entrapment occurs if the suprascapular nerve is compressed as it passes through the suprascapular or spinoglenoid notch.
Epidemiology
Suprascapular nerve entrapment is a relatively rare but often overlooked cause of shoulder pain 1-3.
Risk facto...
Article
Quadrigeminal cistern
The quadrigeminal cistern (also known as superior cistern or cistern of the great cerebral vein) is one of the CSF-filled subarachnoid cisterns.
Boundaries
The boundaries of the quadrigeminal cistern are as follows 2:
anterior: quadrigeminal plate of the midbrain (or colliculi)
posterior: th...
Article
Subependymoma
Subependymomas are uncommon, benign (WHO grade 1) tumors which are slow-growing and non-invasive. They tend to occur in middle-aged and older individuals and usually identified as an incidental finding.
Terminology
These tumors were previously also known as subependymal astrocytomas, not to b...
Article
Megalencephalic leukoencephalopathy with subcortical cysts
Megalencephalic leukoencephalopathy with subcortical cysts, also known as Van der Knaap disease, refers to a rare inherited autosomal recessive disease characterized by diffuse subcortical leukoencephalopathy associated with white matter cystic degeneration.
Epidemiology
The age at symptoms m...
Article
Polymicrogyria
Polymicrogyria is a focal brain abnormality characterized by excessive abnormal small cerebral gyri with cortical over-folding, creating an irregular cortical surface and ill-defined grey-white matter junction 14. Counter-intuitively, it often appears as cortical thickening and simplification wh...
Article
Bern score
The Bern score, also known as the brain spontaneous intracranial hypotension (bSIH) score, is a predictive score derived from brain MRI findings in patients with suspected spontaneous intracranial hypotension. It stratifies patients into high, intermediate or low probability of finding a spinal ...
Article
Germinal matrix hemorrhage (grading mnemonic)
A mnemonic to remember the radiological grading of germinal matrix hemorrhage is:
CV2P
Mnemonic
It can be read as a central venous line
C: limited to the caudothalamic groove/ germinal matrix ( grade I )
V: expansion into ventricles less than 50% ( grade II )
V: dilated ventricles ( grade...
Article
Intracranial mesenchymal tumor, FET-CREB fusion-positive
Intracranial mesenchymal tumors, FET-CREB fusion-positive, are rare only recently described soft tissue neoplasms of intermediate malignancy. They are characterized by the fusion of the FET family of RNA-binding proteins to the CREB family of transcription factors, also seen in extracranial angi...
Article
Germinal matrix hemorrhage (grading)
Grading of germinal matrix hemorrhage has taken several forms over the years. The most commonly used system is the sonographic grading system proposed by Burstein, Papile, et al.
Classification
grade I
restricted to subependymal region/germinal matrix which is seen in the caudothalamic groov...
Article
Intraventricular hemorrhage of the newborn
Intraventricular hemorrhage of the newborn is a distinct entity and considered separately from intraventricular hemorrhage (IVH) in adults.
In neonates, IVH is the result of germinal matrix hemorrhage, which ruptures through the ependymal lining and into the lateral ventricles.
Other causes of...