


Average age: 20 yrs old (younger in skeletal ES, 10 yrs). Equal in both sex (M:F=2:1 in SES). Thigh, paravertebral or intercostal, H&N, pelvis, peritoneum (long bone in lower extremity in SES). Mediastinum, heart, lung, external genitalia, broad ligament. Spinal epidural space.
Extraskeletal ewing