Ear signs in radiology
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Transcript of Ear signs in radiology
![Page 1: Ear signs in radiology](https://reader031.fdocuments.us/reader031/viewer/2022021813/5875f1651a28ab006e8b4f43/html5/thumbnails/1.jpg)
ALL EARS!DR BHAVANA K
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MOUSE EAR SIGN
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MOUSE EAR SIGN• Erosions will usually begin at
the peripheral articular surfaces and extend centrally.
• Marginal erosions and bony overgrowth at the interphalangeal joints can create an appearance which resembles "mouse ears".
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BLADDER EARS• Normal protrusion of lateral
aspect of bladder is seen into the inguinal canal, called "bladder ears“
• Seen in infants.
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DOG EAR SIGN
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DOG EAR SIGN• Dog ear sign of fluid in the
pelvic peritoneal recess.• Supine abdominal radiograph
shows a full bladder which represents the face of the dog.
• The convex soft-tissue opacity representing blood in the left lateral pelvic peritoneal recess and separated from the bladder by a thin hyperlucent strip of extraperitoneal fat is the dog ear.
John H. Harris, Jr. Reflections: Emergency Radiology. Radiology 2001; 218(2): 309-316.
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RABBIT EAR SIGN
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RABBIT EAR SIGN• Bilateral subdural hematomas
may lead to slit like ventricles displaced medially.
• Also called squeezed ventricle or hare’s ears sign
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INVERTED RABBIT EAR SIGN
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INVERTED RABBIT EAR SIGN• Hyperintensities in the dorsal
column due to Vitamin B12 deficiency.
• About 50% resolve completely after vitamin B12 therapy
• Also called Inverted V sign
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EARS OF THE LYNX SIGN
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EARS OF THE LYNX SIGN• Periventricular cone shaped
hyperintensities near the frontal horn resembling the tuft of hair on the ears of the lynx.
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EARS OF THE LYNX SIGN• Seen in hereditary spastic
paraplegia with thin corpus callosum and Marchiafava bignami.
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Thank you!