EPITHELIOID SARCOMA WITH UNUSUAL RADIOLOGICAL FINDINGS

The case of a patient with epithelioid sarcoma in the right arm is rep orted. The diagnosis was delayed because of misinterpretation arising from complexity in the MR findings, including a honeycomb pattern in t he subcutaneous fat simulating lymphedema, and an intramuscular diffus e high signal intensity on T2-weighted images without a discrete mass lesion. The histological findings revealed that the diffuse muscular a bnormality mainly resulted from denervation of the muscles due to peri neural invasion by the tumor, and subcutaneous edema from lymphedema s econdary to lymphatic tumor spread concurrent with lymphatic fibrosis. Multiple foci of cortical erosions in the humerus, a rare manifestati on of this tumor, were detected 6 months later.