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.
16,861 results found
Article
Unroofed coronary sinus
An unroofed coronary sinus, a.k.a. coronary sinus type ASD, is a rare variant of atrial septal defect (ASD). The atrial wall between the coronary sinus and left atrium is either partially or completely absent, resulting in a right-to-left shunt.
It is associated with persistent left-sided super...
Article
Hair artifact
Hair artifact and hair-product artifacts are artifacts produced by the presence of the patient's hair, hair accessories (e.g. hair clip) and hair products (e.g. shampoo) within the field of view during acquisition of an image, which can affect all modalities to varying degrees. For example, in m...
Article
Excretory phase
The excretory phase also known as the urographic phase is a postcontrast injection time range in which there is an optimal enhancement of the renal collecting systems.
Technique
The acquisition time depends on the intravenous device (central or peripheral), the concentration of the contrast me...
Article
Ring of fire sign (adnexa)
The ring of fire sign, also known as ring of vascularity, signifies a hypervascular lesion with peripheral vascularity on color or pulsed Doppler examination of the adnexa due to low impedance high diastolic flow 1.
This sign can be seen in:
corpus luteum cyst (more commonly)
ectopic pregnancy
Article
Omphalomesenteric fistula
Omphalomesenteric fistula occurs as a result of failure of obliteration of the omphalomesenteric duct. It is one of the congenital fistulas of the gastrointestinal tract.
The treatment of choice is often a partial transumbilical resection with umbilical restitution.
See also
gut fistulation
Article
Transverse sinus
The paired left and right transverse sinuses, or lateral sinuses, are major dural venous sinuses and arise from the confluence of the superior sagittal, occipital and straight sinuses at the torcular herophili (confluence of sinuses).
On each side, the transverse sinus then runs in the lateral ...
Article
Periodontitis
Periodontitis is an inflammatory disease affecting the supporting tissues of the teeth. It is a common cause of tooth loss, particularly in the adult population.
Terminology
Different forms of periodontitis are recognized. The terms 'chronic periodontitis' and 'aggressive periodontitis' have b...
Article
Yttrium-90 ibritumomab tiuxetan
Yttrium-90 ibritumomab tiuxetan, also known by the trade name Zevalin (Acrotech Biopharma LLC, USA), is a theranostic radiopharmaceutical approved for the treatment of patients with relapsed or refractory low grade or follicular non-Hodgkin lymphoma (NHL). More specifically, it is a radioimmunot...
Article
Intradural spinal lipoma
Intradural lipomas are a subset of spinal lipomas. They are typically intradural, subpial, juxtamedullary lesions 1 although they have occasionally been reported as entirely intramedullary lesions 2.
Mature fatty tissue within the spinal dura can be seen in a number of entities:
lipomyelo...
Article
Typical pulmonary carcinoid tumors
Typical pulmonary carcinoid tumors are considered the more common and more benign low grade form of peripheral pulmonary carcinoid tumors. There is little or no known association between typical carcinoid tumors and tobacco use or exposure to other carcinogens which contrasts to atypical carcino...
Article
De Quervain thyroiditis
De Quervain thyroiditis, or subacute granulomatous thyroiditis, is a form of self-limited subacute thyroiditis usually preceded by an upper respiratory tract viral infection such as mumps, measles, coxsackie virus, adenovirus, and influenza viruses.
Epidemiology
It usually affects middle-aged ...
Article
Colonic transit study
The colonic transit study is an older technique to estimate colonic transit time.
Terminology
Various names are used for this type of study including shapes study, colon motility test, Sitz marker study and Transit-Pelletsmethod, and variations thereof.
Indications
In constipation, it can ...
Article
Midgut volvulus
Midgut volvulus is a complication of bowel malrotation usually seen in neonates and infants. Presentation is usually with proximal small bowel obstruction and bilious vomiting. Without prompt treatment, there is a real and significant risk of small bowel ischemia, significant associated morbidit...
Article
Neurofibroma
Neurofibromas are benign (WHO grade 1) peripheral nerve sheath tumors that are usually solitary and sporadic. There is, however, a strong association with neurofibromatosis type 1 (NF1), particularly for the plexiform subtype.
Neurofibromas are generally divided into five morphological forms 1...
Article
Bent bone dysplasias (differential)
Bent bone dysplasias are a class of skeletal dysplasia included in a 2010 classification of genetic skeletal disorders 1:
campomelic dysplasia
Stuve-Weidemann dysplasia
kyphomelic dysplasias, a diverse class, including
congenital bowing of the long bones
cartilage-hair hypoplasia (CHH; meta...
Article
Spinoglenoid notch ganglion cyst
Spinoglenoid notch ganglion cysts are a location-specific form of ganglion cysts that arise in the region of the spinoglenoid notch.
Epidemiology
They are generally rare and may be slightly more common in males 2.
Associations
glenoid labral tears: especially SLAP lesions 5
Clinical present...
Article
CT/MRI LI-RADS
CT/MRI Liver Imaging Reporting and Data System (LI-RADS) is an algorithm for diagnosing and staging hepatocellular carcinoma (HCC) (CT/MRI Diagnostic LI-RADS) or assessing the response of HCC to locoregional treatment (CT/MRI Treatment Response LI-RADS) using CT or MRI with extracellular contras...
Article
Skeletal survey (overview)
The skeletal survey is a radiographic series performed to survey the entire skeleton (axial skeleton, upper and lower limbs) for pathology or injury. Specific projections vary depending on the clinical indication and the institution's protocol.
There are various clinical indications that may wa...
Article
Bowl of grapes sign
The bowl of grapes sign has been described in synovial sarcoma. It refers to the characteristic multilobulated lesion subdivided by multiple septa, forming large cystic foci with regions of hemorrhage.
Article
Psoriasis
Psoriasis is an inflammatory dermatological disease with several variants. The most common variant is plaque psoriasis, other variants of the disease are guttate, erythrodermic and pustular psoriasis 1.
Epidemiology
There is a geographic variation in the prevalence of psoriasis such that popul...
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