Fallen fragment sign is a feature of ?
Correct Answer: Simple bone cyst
Description: Ans. is 'a' i.e., Simple bone Simple bone cyst (Solitery/Unicameral bone cyst) Simple bone cyst occurs before the age of 20 years The most common site is proximal humerus (50%)followed by Proximal femur (25-30%). Radiological features are : - Concentric Metaphyseal Expansile lucent (lytic) Well defined border with sclerotic margin Fallen Fragment sign : - Coical fragment of pathological fracture settles in the most dependent poion. Hinged fragment sign : - Sometimes fractured fragment does not separate from adjacent coex.
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