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.
1,380 results found
Article
Limited intimal tear
Limited intimal tears (LIT) of the aorta or limited aortic intimal tears are subtle localized tears of the aortic intima without tear extension and represent an uncommon form of aortic dissection that can manifest as acute aortic syndrome 1-5.
Epidemiology
Limited intimal tears are uncommon an...
Article
Aortoesophageal fistula
Aortoesophageal (aorto-esophageal) fistulae are pathologic communications between the aorta and esophagus and result in life-threatening upper gastrointestinal hemorrhage. They are fatal in the absence of prompt management.
Epidemiology
Aortoesophageal fistulas are a rare entity that accounts...
Article
Inferior vena cava obstruction
Inferior vena cava obstruction, also known as inferior vena cava syndrome, refers to the clinical manifestations occurring as a result of any blockage in the inferior vena cava. It can occur due to external compression, thrombosis of inferior vena cava or iatrogenic placement of filters 1. Certa...
Article
Round ligament varicosities
Round ligament varicosities are dilated and tortuous veins in the round ligament, these are rare although most commonly seen during pregnancy and the postpartum period. They constitute an important differential diagnosis for inguinal masses as to avoid unnecessary surgery and associated complica...
Article
Vasa vasorum
The vasa vasorum represents the supporting microvasculature of the larger caliber arteries and veins of the body.
Gross anatomy
The vasa vasorum has two subtypes in humans 2,3:
arterial vasa vasorum: arises from various arteries based on anatomical location (e.g. intercostal arteries for desc...
Article
Sheehan vessels
Sheehan vessels refer to vessels that arise from neovascularity that develops due to pulmonary hypertension, particularly, but not exclusively, in the context of Eisenmenger syndrome.
Pathology
The exact pathogenesis of Sheehan vessels has not been fully elucidated, but it is felt that neovasc...
Article
Clot meniscus sign (angiography)
The clot meniscus sign, or simply the meniscus sign, is a radiological sign appreciated on digital subtraction angiography in the setting of endovascular clot retrieval for acute ischemic stroke caused by large vessel occlusion.
The sign describes the angiographic appearance of the proximal occ...
Article
Prominent vessel sign
The prominent vessel sign, or prominent hypointense vessel sign, is a radiological sign appreciated on susceptibility weighted imaging (SWI) that is described most commonly in patients with acute ischemic stroke.
The sign describes hypointense blooming artifact seen on SWI brain MRI within mult...
Article
Capillary blush (cerebral)
Capillary blush (or angiographic blush), arteriovenous shunting and early venous filling are terms variably used in digital subtraction cerebral angiography following reperfusion of thromboembolic ischemic stroke to denote the appearance of the reperfused tissue. They are related to each other a...
Article
Hypodense vessel sign
The hypodense vessel sign, or hypodense artery sign, is a radiological sign appreciated on non-contrast CT brain in acute ischemic stroke due to the rare entity of fat macroembolism causing large vessel occlusion. Notably, this is a distinct sign to the hyperdense vessel sign.
The sign describe...
Article
Hyperdense vessel sign
The hyperdense vessel sign is a radiological sign appreciated on non-contrast CT brain whereby there is focal hyperattenuation (mean of approximately 55 HU) within an intracranial blood vessel 1,2. Notably, this is a distinct sign to the hypodense vessel sign.
The hyperdense vessel sign is ofte...
Article
Susceptibility vessel sign
The susceptibility vessel sign is a radiological sign appreciated on susceptibility-sensitive MRI brain sequences that is described in patients with acute ischemic stroke. It correlates well with the hyperdense vessel sign (e.g. hyperdense MCA sign) that may be seen on CT brain, but is considere...
Article
Medium vessel occlusion
Medium vessel occlusion (MeVO), also termed distal medium vessel occlusion (DMVO), describes occlusion of a medium-sized intracranial artery resulting in impending acute ischemic stroke.
Definition
One consensus definition of ‘medium vessel’ suggests intracranial arteries with a luminal diamet...
Article
Large vessel occlusion
Large vessel occlusion (LVO), also termed proximal large vessel occlusion (PLVO), describes occlusion of a proximal and large-sized intracranial artery resulting in impending acute ischemic stroke. The definition of large vessel occlusion varies significantly among clinical trials of endovascula...
Article
Vertebrovenous fistula
Vertebrovenous fistulas are uncommon arteriovenous fistulas between the vertebral artery and the adjacent vertebral venous plexus 1. They can present with a variety of symptoms, including bruits and neurological symptoms and occur either spontaneously, typically in patients with connective tissu...
Article
Anomalous right coronary artery from the pulmonary artery
Anomalous right coronary artery from the pulmonary artery (ARCAPA), is a rare congenital coronary artery anomaly and is considered one of the most severe of such anomalies.
Epidemiology
This abnormality only accounts for less than 0.1% of all congenital cardiac anomalies 1 and is up to four ti...
Article
Soft tissue
Soft tissue is a term used for all the supporting tissues in the body that are not calcified or ossified; therefore soft tissue excludes bone and teeth.
Soft tissue includes:
skin
fat
muscle
tendons
ligaments
fibrous tissues
vasculature
Soft tissue generally excludes the internal body o...
Article
Posterior communicating artery duplication
Posterior communicating artery duplication is a rare variation of the posterior communicating artery, which connects the posterior cerebral artery circulation to the internal carotid artery.
Epidemiology
Duplication has an estimated incidence of 3% 1.
Gross anatomy
Duplication is said to occ...
Article
Achenbach syndrome
Achenbach syndrome, also known as paroxysmal finger hematomas or acute idiopathic blue finger, is a rare disorder characterized by spontaneous rupture of digital arteries with resultant hematomas 1-3.
Epidemiology
Achenbach syndrome is more common in women, typically in middle to older age (30...
Article
Anomalous origin of one pulmonary artery
Anomalous origin of one pulmonary artery from the aorta (AOPA) represents a rare congenital cardiovascular anomaly. One pulmonary artery originates from the aorta and the other from the right ventricular outflow tract 1-3. It more often involves the right pulmonary artery than the left pulmonary...
Unable to process the form. Check for errors and try again.