Spinal epidural extraskeletal Ewing sarcoma in an adolescent boy: a case report.

Extraskeletal Ewing sarcoma (EES) represents a rare soft tissue malignant neoplasm histologically similar to skeletal Ewing sarcoma. It occurs mainly in adolescents and young adults and commonly affects the paravertebral regions. The differential diagnosis includes other small, blue round cells tumors. The authors report a case of an EES involving the spinal epidural and paravertebral spaces in an adolescent boy. EES diagnosis was confirmed by features of histologic analysis and immunohistochemistry and by the presence of the t(11;22)(q24;q12) chromosomal translocation by reverse transcriptase-polymerase chain reaction.