Primary cutaneous extraskeletal Ewing's sarcoma: A case report of an extremely rare entity

Primary cutaneous extraskeletal Ewing's sarcoma is an extremely uncommon entity. Patients are mostly female in the second decade of life, and the clinical presentation usually consists of a single superficial mass of 2–3 cm, oval-shaped, flesh-colored, soft, moveable, and sometimes painful. The diagnosis is difficult and depends on histological, immunohistochemical, and cytogenetical analysis. The prognosis is usually favorable with a survival rate of 91% in 10 years. We describe a 20-year-old man with a primary cutaneous Ewing's sarcoma localized on the pulp of the right 5th finger. It is very important to report all cases to improve the characterization of this pathology. In the presence of a cutaneous lesion with this clinical presentation, it is important to request the anatomopathological study and include this entity as a differential diagnosis, so that we can improve the diagnostic timing and therefore the prognosis.