Articles

Cases

Courses

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.

Create new article

16,879 results found

Target sign (disambiguation)

There are many bull's eye signs, many also called target signs: Gastrointestinal intussusception: see target sign of intussusception barium studies 2 aphthoid ulcers: earliest lesion seen in Crohn disease gastric lymphoma with central ulceration 4 gastric adenocarcinoma with central ulcer...

Meckel diverticulum

Meckel diverticulum is a congenital intestinal diverticulum due to fibrous degeneration of the umbilical end of the omphalomesenteric (vitelline) duct that occurs around the distal ileum. It is considered the most common structural congenital anomaly of the gastrointestinal tract. Epidemiology ...

Medical abbreviations and acronyms (I)

This article contains a list of commonly used medical abbreviations and acronyms that start with the letter I 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...

Hypervascular liver lesions

Hypervascular liver lesions are findings that enhance more or similarly to the background hepatic parenchyma in the late arterial phase, on contrast-enhanced CT or MRI. Differential diagnosis Non-neoplastic focal nodular hyperplasia (FNH) bright arterial phase enhancement except central scar...

Bosniak classification system of renal cystic masses (version 2005)

The Bosniak classification system of renal cystic masses, now known as Bosniak v2005, divides renal cystic masses into five categories based on imaging characteristics on contrast-enhanced CT, and helps predict a risk of malignancy and suggests either follow-up or treatment. An updated classific...

Pituitary stalk interruption syndrome

Pituitary stalk interruption syndrome, also known as pituitary stalk transection syndrome, is a syndrome characterized by an absent or hypoplastic anterior pituitary gland, thin or absent infundibulum, and ectopic posterior pituitary location. Epidemiology Pituitary stalk interruption syndrome...

Spinal nucleus of the trigeminal nerve

The spinal nucleus of the trigeminal nerve is one of three major nuclei that make up the trigeminal sensory nerve nuclear complex along with the main sensory nucleus and the mesencephalic nucleus 1,2. Gross anatomy The spinal nucleus of the trigeminal nerve is a paired structure and is an infe...

Endometrial polyp

Endometrial polyps are benign nodular protrusions of the endometrial surface, and one of the entities included in a differential of endometrial thickening. Endometrial polyps can either be sessile or pedunculated. They can often be suggested on ultrasound or MRI studies but may require sonohyste...

Eye of the tiger sign (globus pallidus)

The eye of the tiger sign refers to symmetric bilateral abnormal low signal on T2-weighted MRI (due to abnormal accumulation of iron) in the globus pallidus with central high signal (due to gliosis and spongiosis). The eye of the tiger sign is most classically associated with pantothenate kinas...

Decompressive craniectomy

Decompressive craniectomies are craniectomies performed to relieve raised intracranial pressure, most commonly in the setting of florid cerebral edema following cranial trauma or swelling following infarction 1. History Craniectomies for the treatment of cranial trauma date back to at least 10...

Guillain-Barré syndrome

Guillain-Barré syndrome (GBS) is a heterogeneous group of autoimmune polyradiculopathies, involving sensory, motor, and autonomic nerves. It is the most common cause of rapidly progressive flaccid paralysis. It is believed to be one of a number of related conditions, sharing a similar underlying...

Anti-GQ1b antibody syndrome

Anti-GQ1b antibody syndrome refers to a spectrum of neurological conditions which share autoantibodies to the ganglioside complex GQ1b, and have overlapping clinical presentations. Clinical presentation Typical anti-GQ1b antibody syndromes with ophthalmoplegia include 1,3: Miller Fisher syn...

Pneumatocele

Pneumatoceles are intrapulmonary gas-filled cystic spaces that can have a variety of sizes and appearances. They usually occur as a result of pneumonia or in neonates as the result of a ventilator-induced lung injury. They should not be mistaken for a cavitating lung mass. Epidemiology Althou...

Dynamic hip screw

A dynamic hip screw (DHS) is a femoral head-sparing orthopedic device used to treat femoral neck fractures. It is sometimes referred to as a pin and plate. Femoral neck fractures that are undisplaced and hence have a low risk of osteonecrosis (Garden I and II fractures) can be treated with head...

Bertolotti syndrome

Bertolotti syndrome refers to the association between lumbosacral transitional vertebrae and low back pain. Although it may be a consideration in younger patients, the entity is considered controversial and has been both supported and disputed. Some studies suggest lumbosacral transitional vert...

Split scar sign (rectal cancer response assessment)

The split scar sign has been described as a feature on rectal cancer MRI studies acquired following chemoradiotherapy and having a high specificity and positive predictive value for a complete response 1. In a meta-analysis that observed an average complete response rate of 38%, the presence of ...

Myocardial area at risk

The myocardial area at risk (AAR) is defined by the ischemic proportion of the myocardium after coronary occlusion and reflects the potential size of the myocardial infarction 1-9. Usage The assessment of the myocardial area at risk is an important measure in the evaluation of the potentially ...

Cerebellar hemorrhage

Cerebellar hemorrhages are a common form of intracerebral hemorrhage (ICH) and usually occur due to poorly controlled long-standing hypertension, although other causes also exist. When due to chronic hypertension, the stigmata of chronic hypertensive encephalopathy are often present (see: cerebr...

Pontine hemorrhage

Pontine hemorrhages are a common form of intracerebral hemorrhage, and usually are a result of poorly controlled long-standing hypertension, although also have other causes. When due to chronic hypertension, the stigmata of chronic hypertensive encephalopathy are often present (see cerebral micr...

Sinusoidal obstruction syndrome

Sinusoidal obstruction syndrome (SOS), previously known as hepatic veno-occlusive disease (VOD), is a condition arising from occlusion of hepatic venules. Clinical presentation right upper quadrant pain painful hepatomegaly ascites abnormal liver function tests Pathology Toxic injury to l...

Filtered (1)Done (clear)

+Systems

+Article Sections

×Sort By

ADVERTISEMENT: Supporters see fewer/no ads

Updating… Please wait.

Unable to process the form. Check for errors and try again.

Thank you for updating your details.