Ankle tear drop sign
50-year old women admitted to ER due to ankle sprain 10 days ago. She was complaining of ankle pain and swelling around the lateral malleolus.
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The teardrop-shaped opacity represents fluid in the inferior space of the anterior compartment of the ankle joint.
It has been postulated that at least 5 ml of effusion is needed in order to depict it using lateral x-ray projection in the neutral position.