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.
16,905 results found
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
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
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:
lipomyelocele/...
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
Sutural diastasis
Sutural diastasis is an abnormal widening of the skull sutures. It may be physiological in a neonate during a growth spurt.
Pathology
In non-traumatic scenarios accelerated growth of the sutural connective tissue without concurrent ossification is the underlying pathology.
Etiology
traumat...
Article
Metatarsus adductus
Metatarsus adductus is a type of foot deformity where there is medial deviation of the first metatarsal +/- medial displacement of the metatarsals on the cuneiform.
Epidemiology
It is considered the most common congenital foot abnormality.
Pathology
It can be congenital or acquired.
Associa...
Article
Adrenal vein sampling
Adrenal vein sampling (AVS) is a procedure where blood is collected from the adrenal veins via catheter to confirm autonomous hormone production, if it is unilateral or bilateral, and to guide further treatment 1. If unilateral, the adrenal gland can be removed by surgery; thus curing secondary ...
Article
Hypertrophic osteoarthropathy
Hypertrophic osteoarthropathy (HOA) is a syndrome characterized by a periosteal reaction of the long bones without an underlying bone lesion. There is a broad range of manifestations, although typically there is symmetrical involvement of the appendicular skeleton. Accompanying abnormal soft tis...
Article
Involucrum
An involucrum (plural: involucra) is a complication of osteomyelitis and represents a thick sheath of periosteal new bone surrounding a sequestrum.
Terminology
Involucrum should be used in the context of chronic osteomyelitis to describe an area of thickened viable bone that forms around an ar...
Article
Friedman line
The Friedman or scapular line can be used to determine glenoid version and glenoid bone loss 4. Glenoid version angle measured by the Friedman method has better inter-reader reliability than the scapular body method 2.
Measurement
The Friedman line is drawn along the long axis of the scapula ...
Article
Tuberculous bronchostenosis
Tuberculous bronchostenosis is a potential complication that can occur from endobronchial tuberculosis, especially in a chronic form.
Pathology
Bronchostenosis usually begins as simple erythema and edema with lymphocytic submucosal infiltration followed by tubercle formation. Destruction and r...
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