This case report describes the rare occurrence and histologic characteristics of a small cell osteosarcoma located on the calcaneus in a pediatric patient.
Alerts clinicians to rare calcaneal small cell osteosarcoma mimicking Ewing sarcoma in children; leaves open need for larger series and molecular validation.
Small cell osteosarcoma is rare, representing 1-4% of all osteosarcomas. We experienced a case of small cell osteosarcoma in an 8-year-old girl on her calcaneus. Histologically, the tumor consists of small round cells that resemble those of Ewing's sarcoma, and variable foci of lacy osteoid formation between tumor cells. The rare location, histologic characteristics and differential diagnostic points are discussed.
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Park et al. (1995) studied this question.
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