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ALL EARS!DR BHAVANA K
MOUSE EAR SIGN
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".
BLADDER EARS• Normal protrusion of lateral
aspect of bladder is seen into the inguinal canal, called "bladder ears“
• Seen in infants.
DOG EAR SIGN
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.
RABBIT EAR SIGN
RABBIT EAR SIGN• Bilateral subdural hematomas
may lead to slit like ventricles displaced medially.
• Also called squeezed ventricle or hare’s ears sign
INVERTED RABBIT EAR SIGN
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
EARS OF THE LYNX SIGN
EARS OF THE LYNX SIGN• Periventricular cone shaped
hyperintensities near the frontal horn resembling the tuft of hair on the ears of the lynx.
EARS OF THE LYNX SIGN• Seen in hereditary spastic
paraplegia with thin corpus callosum and Marchiafava bignami.
Thank you!