LearningRadiology spotlights the "fallen fragment sign" in solitary unicameral bone cysts

The "fallen fragment sign" on imaging—a bone fragment dependent in a cystic lesion—is a pathognomonic finding for a solitary (unicameral) bone cyst, helping distinguish it from other lucent bone lesions.

• The sign is most often seen after a pathologic fracture through the cyst.
• This is an educational imaging pearl from LearningRadiology, not a new research study.

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