Ewing's sarcoma of the spinal epidural space: report of two cases.

Abstract
Two new cases of primary extraosseous Ewing''s sarcoma of the spinal epidural space, and their histogenesis and differential diagnosis are described. The diagnosis of Ewing''s sarcoma, which is essentially an undifferentiated tumor, depends largely on the exclusion of several other neoplasms with morphological similarities. With these 2 cases, 43 extraosseous Ewing''s sarcomas have been reported to date, 7 of which of were epidural in location.