Recurrent Subcutaneous Ewing Sarcoma on 18F-FDG PET/CT

Abstract

Subcutaneous Ewing sarcoma is very rare. This report presents the case of a 23-year-old woman with a history of primary subcutaneous Ewing sarcoma who recently found a gradually increasing mass. Recurrent subcutaneous Ewing sarcoma was thus suspected. 18F-FDG PET/CT was performed and showed an FDG-avid mass in her buttocks. Subsequent histopathological and immunohistochemical tests were consistent with subcutaneous Ewing sarcoma.

Recurrent Metastatic Ewing Sarcoma Involving Only in the Muscles of Extremities Shown on FDG PET/CT

“…7 Metastasis in multiple muscles without other sites of involvement is an unusual feature of Ewing sarcoma recurrence. FDG PET/CT findings of some unusual sites of both primary extraosseous Ewing sarcomas [8][9][10][11] and metastases 12,13 have been reported before. Here we present the case of a 6-year-old patient in whom FDG/PET CT demonstrated multifocal hypermetabolic nodular muscle metastases in the extremities without any other locations of tumor involvement.…”