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Extramedullary hematopoiesis is a complication of myeloproliferative neoplasms or of chronic hemolysis. The more frequent localizations are splenic, ganglionic or paraspinal. Rarely, extramedullary hematopoiesis is associated with solid cancer. We report an original case of sarcoma located in an extramedullary hematopoiesis mass in a 72-year-old woman suffering from hereditary spherocytosis. An asymptomatic right paravertebral mass was found in 2004; the biopsy confirmed extramedullary hematopoiesis. In 2016, the patient w