Ewing's sarcoma in a 52 year-old women with leg pain

Ewing's sarcoma (ES) is the second most common primary sacral tumor. ES are aggressive tumors with a tendency toward recurrence following resection and pronounced proclivity toward hematogenous metastasis to lungs and bone. A 52-year-old woman presented with of pain in her right posterior thigh radiating to the back of the knee. A magnetic resonance imaging showed an irregularly shaped right presacral mass. A core needle biopsy revealed a small, round blue cell neoplasm suggestive of a primitive neuroectodermal tumor