Ewing Sarcoma in an Infant Metacarpal.

We describe a case of Ewing sarcoma in the metacarpal of a 5-month-old male. After pain, erythema, and swelling of the hand failed to resolve with antibiotics, radiographs and magnetic resonance imaging raised suspicion for a neoplastic condition. Open biopsy confirmed the diagnosis of Ewing sarcoma and treatment with chemotherapy and surgical resection was initiated. Ewing sarcoma of the hand in a patient this young is an exceedingly rare diagnosis, which highlights the importance of a broad differential diagnosis when the treatments for more common conditions fail.