Ewing sarcoma in calcenous presented as chronic osteomyelitis: a case report and literature review.

Ewing's sarcoma (ES) is an uncommon primary malignant tumor of the bone, mostly affecting 5-20 years of age with male predominance. It commonly affects the diaphysial region of long bones, while the small bones of hands and feet are extremely rare (3-5%) to be affected. The authors report a case of calcaneal ES which was misdiagnosed as bacterial chronic osteomyelitis and treated inappropriately. A high index of suspicion is required in diagnosing tumors at rare sites to avoid undue delay in initiating appropriate therapy. As the overall prognosis of ES of the calcaneum is lower compared to other sites, these tumors should have an extensive radiological evaluation and histological confirmation, as misdiagnosis and treatment delays will have detrimental outcomes.