Items tagged “signs”

44 results found
Article

Positive metacarpal sign

In the metacarpal sign, a line drawn along the heads of the 4th and 5th metacarpals will intersect the head of the 3rd metacarpal if shortening is present. The shortened 4th metacarpal is the key to the sign. The sign is positive in up to 9.6% of normal individuals 3. It is however seen in a va...
Article

Open ring sign

The open ring sign is a relatively specific sign for demyelination, most commonly multiple sclerosis (MS), and is helpful in distinguishing between the causes of ring enhancing lesions. Interestingly open ring enhancement is not seen in neuromyelitis optica (NMO).  Radiographic features The en...
Article

Caput medusae sign (developmental venous anomaly)

The caput medusae sign, refers to developmental venous anomalies of the brain, where a number of veins drain centrally towards a single drain vein. The appearance is reminiscent of Medusa, a gorgon of Greek mythology, who was encountered and defeated by Perseus. The sign is seen on both CT and ...
Case

Bracket sign of corpus callosum lipoma

SKULL AP RADIOGRA...
 Diagnosis certain
Dr Paresh K Desai
Published 07 Dec 2015
83% complete
X-rayCT
Case

Air crescent sign

 Diagnosis almost certain
A.Prof Frank Gaillard
Published 22 Feb 2010
55% complete
CT
Case

Rigler sign

 Diagnosis certain
Dr Hani Salam
Published 25 Feb 2010
60% complete
X-ray
Article

Fallen fragment sign

The fallen fragment sign refers to the presence of a bone fracture fragment resting dependently in a cystic bone lesion. This finding is said to be pathognomonic for a simple (unicameral) bone cyst following a pathological fracture. Although it has occasionally been reported with other cystic le...
Case

Deep sulcus sign

Deep sulcus sign
 Diagnosis almost certain
Dr Hani Salam
Published 19 Mar 2011
44% complete
X-ray
Case

Subdiaphragmatic free gas

 Diagnosis certain
Dr Hani Salam
Published 19 Mar 2011
60% complete
X-ray
Case

Spinal cord metastasis

 Diagnosis almost certain
Dr Hani Salam
Published 13 May 2011
68% complete
MRI
Case

Cartilage interface sign - supraspinatus tear

 Diagnosis almost certain
Dr Andrew Dixon
Published 05 Jul 2011
71% complete
UltrasoundAnnotated image
Article

Pancake brain

Pancake brain, is the classical sign of alobar holoprosencephaly. It is due to fusion of the cerebral hemispheres leaving a single ventricle in its center. It is the most severe form of holoprosencephaly. It is associated with multiple facial abnormalities. See also pancake vertebra vegetable...
Article

White cerebellum sign

White cerebellum sign, also called reversal sign or dense cerebellum sign, is encountered when there is a diffuse decrease in density of the supratentorial brain parenchyma, with relatively increased attenuation of the thalami, brainstem and cerebellum. This sign indicates irreversible brain dam...
Article

Bare orbit sign (sphenoid wing)

The bare orbit sign, is described as a characteristic appearance of the orbit, seen when the innominate line is absent. The innominate line is a projection of the greater wing of the sphenoid, and its absence or destruction is responsible for this appearance. It is the classical frontal radiogr...
Article

Leopard skin sign (white matter)

The leopard skin sign (also known as tigroid pattern or stripe sign) results from dark-spots or stripes (spared perivascular white matter) within bright demyelinated periventricular white matter on T2W images. It is characteristically seen in : metachromatic leukodystrophy Pelizaeus-Merzbacher...
Article

Tau sign

The tau sign represents the appearance of a persistent trigeminal artery on the sagittal plane of an angiogram or on sagittal MRI images. It resembles the greek letter τ, pronounced 'tau'. Persistent trigeminal artery arises from the junction between the petrous and cavernous ICA and runs poster...
Case

Pneumoperitoneum

 Diagnosis certain
Dr Varun Babu
Published 13 Sep 2012
85% complete
X-ray
Case

H-shaped vertebrae

 Diagnosis almost certain
Dr Mark Holland
Published 18 Sep 2012
79% complete
X-ray
Case

Frimann-Dahl sign of sigmoid volvulus

 Diagnosis certain
Dr Mohammad Taghi Niknejad
Published 05 Dec 2012
88% complete
X-rayAnnotated image
Case

CT angiogram sign - pulmonary lymphoma

 Diagnosis almost certain
Dr Mohammad Taghi Niknejad
Published 13 Jan 2013
80% complete
CT

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