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.
1,387 results found
Article
Hemangioendothelioma
A hemangioendothelioma is a tumor derived from blood vessels.
Pathology
Subtypes
Subtypes dependent on location include
hemangioendothelioma (MSK)
hemangioendothelioma of liver
See also
epithelioid hemangioendothelioma
Article
Single coronary artery
Single coronary arteries are rare (incidence 0.03-0.07%), with a higher incidence in patients with congenital heart disease (in particular truncus arteriosus and pulmonary atresia). They occur when there is a single ostium arising from the aorta with no ectopic ostia. There is a wide variety of ...
Article
Adrenal arteries
The adrenal glands are highly vascular. Threefold arterial supply includes the:
superior adrenal arteries: typically 6-8 in number, arising from the ipsilateral inferior phrenic artery
middle adrenal artery: one or more, arising from lateral side of abdominal aorta
inferior adrenal artery: o...
Article
Inferior hypophyseal arterial circle
The inferior hypophyseal arterial circle, also known as the inferior capsular arterial rete, is an anastomotic arterial network formed around the base of the pituitary gland by branches from three vessels, themselves branches off the cavernous portion of the carotid artery. They are:
inferior h...
Article
External carotid artery
The external carotid artery (ECA) is one of the two terminal branches of the common carotid artery that has many branches that supplies the structures of the neck, face and head. The other terminal branch is the internal carotid (ICA), which is somewhat larger than the ECA, which supplies the in...
Article
Infantile hemangioma
Infantile hemangiomas are benign vascular neoplasms that are the most common head and neck tumors of infancy. They can occur virtually anywhere, but the majority are found in the head and neck regions.
This article aims to be a generic discussion of the condition, for detailed and more specific...
Article
Bouthillier classification of internal carotid artery segments
Alain Bouthillier et al. described a seven segment internal carotid artery classification system in 1996 1. It remains the most widely used system for describing the internal carotid artery segments.
A helpful mnemonic for remembering ICA segments is:
C'mon Please Learn Carotid Clinical Organ...
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
Persistent dorsal ophthalmic artery
The persistent dorsal ophthalmic artery is a rare anatomical variant of the ophthalmic artery. Instead of arising from the supraclinoid (C6) segment of the internal carotid artery, as is normally the case, the persistent dorsal ophthalmic artery arises from the lateral aspect of the cavernous (C...
Article
Thoracoacromial artery
The thoracoacromial artery is a vessel arising from the axillary artery at the axilla.
Summary
origin: first branch of the second part of the axillary artery 1
location: axilla
supply: pectoralis major and minor, anterior part of the deltoid, and the clavipectoral fascia 2
main branches: cl...
Article
Doppler waveforms
Doppler waveforms refer to the morphology of pulsatile blood flow velocity tracings on spectral Doppler ultrasound. Waveforms differ by the vascular bed (peripheral, cerebrovascular, and visceral circulations) and the presence of disease.
Radiographic features
Ultrasound
Doppler
Most authori...
Article
Acute coronary syndrome
Acute coronary syndrome (ACS) is a group of cardiac diagnoses along a spectrum of severity due to the interruption of coronary blood flow to the myocardium, which in decreasing severity are:
ST elevation myocardial infarction (STEMI)
non-ST elevation myocardial infarction (NSTEMI)
unstable an...
Article
Pretzel sign (serpentine aneurysm)
The pretzel sign is seen on DSA and is indicative of a serpentine aneurysm 1.
The sign refers to the sinusoid configuration of the intra-aneurysmal vascular channel seen in serpentine aneurysms, giving it the appearance of a pretzel.
Article
Microscopic polyangiitis
Microscopic polyangiitis (MPA) is a small vessel non-granulomatous necrotizing vasculitis. It most often affects venules, capillaries, arterioles, and small arteries, although it occasionally involves medium-sized arteries.
Epidemiology
It typically affects middle-aged individuals.
Clinical p...
Article
Infundibulum (artery)
An infundibulum (plural: infundibula) is a conical outpouching from an artery (usually intracranial), with a broad base narrowing to an apex from which a vessel originates. The most common location for an infundibulum is the origin of the posterior communicating artery (PCOM) from the supraclino...
Article
Persistent carotid-vertebrobasilar anastomoses
The persistent carotid-vertebrobasilar anastomoses are variant anatomical arterial communications between the anterior and posterior circulations due to abnormal embryological development of the vertebrobasilar system. They are named, with the exception of the proatlantal artery, using the crani...
Article
Uterine arteriovenous malformation
Uterine arteriovenous malformations (AVMs) result from the formation of multiple arteriovenous fistulous communications within the uterus without an intervening capillary network.
Terminology
Somewhat confusingly, the term “uterine arteriovenous malformation” has been used interchangeably with...
Article
Marginal sinus (foramen magnum)
The marginal sinus is a dural venous sinus and runs along the inner margin of foramen magnum. It has numerous communications with regional venous structures 1-2:
anteriorly: basilar venous plexus
posteriorly: occipital sinus
laterally
sigmoid sinus
veins of the hypoglossal canal
inferiorl...
Article
Pseudoendoleak
Pseudoendoleak is a color Doppler ultrasound phenomenon caused by spurious color signal in the aneurysm sac following endovascular aneurysm repair (EVAR).
Radiographic features
Pseudoendoleak is defined as flow signal on color Doppler in the aneurysm sac following EVAR, without evidence of lea...
Article
Gastric varix
Gastric varices are an important portosystemic collateral pathway, occurring in ~20% of patients with portal hypertension. They are considered distinct from esophageal varices in that they have a propensity to hemorrhage at comparatively lower portal pressures 1, and are also associated with hig...
Unable to process the form. Check for errors and try again.