Presacral extramedullary hematopoiesis: report of a case and review of the literature.

Extramedullary hematopoiesis is manifested by several clinical hematological disorders. Its localization to presacral space as mass is extremely rare. We report one such case in a patient with hereditary spherocytosis. In the appropriate clinical setting when the imaging appearances are typical, biopsy may not be necessary for diagnosis.