SCLEROSING EPITHELIOID FIBEROSARCOMA - SHORT T2 ON MR-IMAGING

A case of sclerosing epithelioid fibrosarcoma and its appearance on MR I is presented. The tumor showed a zonal architecture on MRT with a la rge central core of very low signal intensity and a peripheral rim of intermediate to high signal intensity on T1- and T2-weighted spin echo pulse sequences. The core showed decreased cellularity with dense col lagen deposition on histologic examination, and the peripheral zone in creased cellularity with increased nuclear atypia. The presence of a p rominent region of very low signal intensity on T1- and T2-weighted im ages can be seen with neural tumors, giant cell tumor of the tendon sh eath, aggressive fibromatosis, and, in rare instances, with soft tissu e sarcomas rich in collagen.