Abstract
Review of 39 cases of sarcomas involving soft tissues, especially of the lower extremity and paravertebral region of children and young adults, disclosed a uniform histologic picture that was indistinguishable from that of Ewing's sarcoma of bone (1). Biopsy of a soft tissue tumor of the right thigh of a ten year old boy was studied by light microscopy and diagnosed as poorly differentiated sarcoma, probably extra skeletal Ewing's sarcoma (2). A portion of the biopsy was processed for electron microscopy to elucidate the ultrastructural pathology.The specimen revealed a neoplasm, consisting of sheets of viable as well as necrotic tumor cells. The viable cells had a single large rounded, oval or kidney- shaped nucleus with one or more dense nucleoli and chromatin with occasional clumping along the periphery and also in the interior.
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