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Solitary Bone Cyst with Epiphyseal Involvement: Confirmation with Magnetic Resonance Imaging. A Case Report and Review of the Literature*
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Investigation performed at Children's Hospital Medical Center, Cincinnati
J Bone Joint Surg Am, 1996 Jun 01;78(6):911-5
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Documented epiphyseal extension of a solitary unicameral bone cyst in the presence of an open physis is extremely rare3,15. Epiphyseal extension by such cysts has been noted on plain radiographs3, on computed tomography15, and intraoperatively10. We report an unusual case of a skeletally immature child in whom magnetic resonance imaging clearly demonstrated extension of a solitary bone cyst into the proximal humeral epiphysis. The portions of the cyst in the epiphysis and metaphysis communicated through a defect in the physis that was probably due to erosion by the cyst. Progressive limb-shortening developed. The purpose of the current report is to describe the natural history and pathogenesis of physeal involvement by a unicameral bone cyst.
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