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Typical appearances of a simple or unicameral bone cyst in the upper humerus with pathological fracture and resultant "fallen fragment".
Patient was treated expectantly (non-surgical management the cyst) resulting in the appearances of the previous film, where the cyst has almost healed by sclerosis apart from a small residual cystic component in the upper lateral aspect. Note the site of fracture is still seen as a transverse linear lucency with sclerotic margins in the mid medial aspect of the lesion.