Items tagged “snippet”

92 results found
Article

Normal facial nerve enhancement on MRI

The normal facial nerve (CN VII) can demonstrate some enhancement post gadolinium, with the prevalence of which segments is highly variable depending on the MRI sequence 4-8. Enhancement may be asymmetric 4-6. It has been attributed to the circumneural facial arteriovenous plexus. Typical sites...
Article

Doge cap sign (pneumoperitoneum)

The doge cap sign, also referred to as Morison pouch sign, is a radiographic sign of pneumoperitoneum. It presents as a triangular-shaped (although may also be crescentic or semicircular) gas lucency, usually bound by the 11th rib in the right upper quadrant on abdominal radiographs due to air i...
Article

Reviewing edits

Reviewing edits on Radiopaedia is paramount to ensuring that our content is relevant and of high quality. This page is mostly useful for editors of the site but may be helpful for general users to gain an insight into what happens behind the scenes at Radiopaedia. Edits Whenever an edit is ma...
Article

Testicular fracture

Testicular fracture is a break in the parenchyma of the testis as a result of blunt trauma.  Radiographic features Ultrasound A fracture line can be seen as a hypoechoic and avascular area within the testis but is only seen in 17% of cases 1. A tunica albuginea rupture may also be present 1. ...
Article

Facet joint arthropathy

Facet joint arthropathy (also known as facet joint arthrosis) is a common cause of low back pain and is most commonly due to osteoarthritis. It occurs from facet joint chondral loss, osteophyte formation and hypertrophy of the articular processes that may cause spinal canal stenosis in severe ca...
Article

High-riding brachiocephalic artery

A high-riding brachiocephalic artery is a rare variant of the neck vessels in which the brachiocephalic artery passes much more superiorly than normally. It is a clinically important variant, as mistaking it for a neck lump and sampling it or neck surgery in the region may cause a devastating he...
Article

Subchondral fracture

A subchondral fracture is a fracture of the trabecular cancellous bone just beneath the subchondral bone plate without disruption of the articular surface 1. Epidemiology Subchondral insufficiency fractures are more common in elderly women 1,4,6. Subchondral fractures due to trauma can occur a...
Article

Germinal matrix

The germinal matrix is an embryological structure in the fetal brain which is only seen in the fetus and in premature neonates. It is the most vulnerable area of the fetal brain and associated pathology carries significant mortality and morbidity.  Gross anatomy  The germinal matrix is usually...
Article

Mediastinitis

Mediastinitis by definition refers to inflammation of the connective tissues and fat within the mediastinum.  In clinical practice; mediastinitis is generally used to refer to acute mediastinitis, resulting from bacterial infection within the mediastinum. This is considered a serious and potent...
Article

Trochlear facet asymmetry

Trochlear facet asymmetry (FA) refers to the condition of the medial facet being abnormally small if compared to the lateral facet in trochlear dysplasia 1. Usage Facet asymmetry is also used as a measurement in magnet resonance imaging for trochlear dysplasia to make it more objective 1-3, th...
Article

Ventral trochlear prominence

Ventral trochlear prominence (VTP) describes and measures the bony surplus in the anterior femoral surface at the most superior or proximal aspect of the trochlea. Usage Ventral trochlear prominence is used for the assessment of trochlear dysplasia, a risk factor for patellofemoral instability...
Article

T-sign (elbow MRI)

The T-sign in an elbow MRI is seen on coronal T2 or fat-saturated intermediate weighted images and refers to the interposition of joint fluid between ulnar insertion of the ulnar collateral ligament and the sublime tubercle and indicates a partial undersurface tear of the distal anterior bundle ...
Article

Posterior inferior tibiofibular ligament

The distal posterior inferior tibiofibular ligament (PITFL) is a strong ligament of the tibiofibular syndesmosis. Gross anatomy The posterior tibiofibular ligament is formed of multiple collagen bundles with interposed fatty tissue and courses obliquely downward from the posterior distal tibia...
Article

Cardiac tissue characterization

Cardiac tissue characterization is a term for an approach in cardiac imaging used for the evaluation of the myocardial tissue in respect to its inherent properties as opposed to cardiac function e.g. in cine or strain imaging. In cardiac magnetic resonance imaging tissue characterization typica...
Article

Palmar ulna bursa

The palmar ulna bursa is one of the bursae in the palmar surface of the hand. Gross anatomy The palmar ulnar bursa is usually the larger bursa and encases the majority of the flexor tendons. It typically originates at the level of the pronator quadratus muscle and continues distally to approxi...
Article

Pixel shift (reregistration)

Pixel shift or reregistration is a post-processing technique used to improve misregistration artifact in digital subtraction angiography, where two images to be subtracted are spatially realigned with respect to one another, by shifting pixels vertically, horizontally or obliquely.  Pixel shift...
Article

Staghorn pattern of vascularity

The staghorn pattern of vascularity is a pathological term describing a pattern of vascularity seen on low-power light microscopy. It is defined by multiple thin-walled, sharply-branched and jagged vessels having an "antler-like" or "staghorn-like" appearance 1. It is classically described with...
Article

Medial collateral ligament bursa

The medial collateral ligament bursa is one of the bursae of the knee with the shape of a vertically expanding compartment located between the superficial and deep portions of the medial collateral ligament 1-5. The bursa is usually located at the middle third of the knee, with the anterior marg...
Article

Sinuvertebral nerve

The sinuvertebral nerve, also known as the recurrent meningeal nerve, or the recurrent nerve of Luschka, is a branch of the primary ventral ramus and grey ramus communicans in the intervertebral foramen. It enters the spinal canal and supplies the posterior portion of the annulus of the interver...
Article

Phantom organ sign

The phantom organ sign is a term used when a large mass arises from a small organ and as a consequence, it is impossible to detect the affected organ. The identification of this sign and other radiological signs such as the embedded organ sign, beak sign, and prominent feeding artery sign on CT...

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