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we present a large heterogenously enhancing, well defined, lobulated multilocular cystic lesion seen involving           abdominal wall. Biopsy followed by total resection of the lesion showed a spindle cell sarcoma with hemangiopericytomatous pattern, which was consistent with monophasic synovial           sarcoma on histology and immunohistochemistry. The unusual clinical presentation, radiology, pathology and differential             diagnosis will be discussed in detail.

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