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 tumour, depends largely on the exclusion of several other neoplasms with morphological similarities. With these two cases, 43 extraosseous Ewing's sarcomas have been reported to date, seven of which were epidural in location.
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