[Extraskeletal Ewing sarcoma: differential diagnosis of a soft tissue tumor].

We report on a 30-year-old man from Vietnam who complained about diffuse pain in the left epigastrium. Using the ultrasound a pleural effusion in the left recessus costodiaphragmaticus was found. The chest X-ray showed a paravertebral soft-tissue tumor at the left side, with CT and NMR a sarcoma was suspected. The patient was treated by local resection of the tumor, histologically an extraosseous Ewing's sarcoma was identified. Due to the following chemotherapy and local radiation therapy no local recurrence and metastases have developed for 32 months.