Mi Hye Yu1, Jeong Min Lee2, Jee Hyun Baek2, Joon Koo Han1, Byung-Ihn Choi1
1Radiology, Seoul National University Hospital, Seoul, Korea; 2Radiology, Seoul National University, Seoul, Korea
We investigated the imaging features of GIST of the GI tract on dynamic contrast-enhanced MRI. The most common MR imaging feature of GIST of the GI tract was well-defined, lobulated, exophytic growing tumor showing obvious and gradually progressive enhancement, and heterogeneity with intratumoral hemorrhage or necrotic/cystic change. The enhancement pattern, enhancement grade and heterogeneity of GIST were variable according to the size of the tumor. Small GIST appeared as round tumor with obvious, early strong or peripheral to central enhancement, meanwhile large GIST appeared as lobulated exophytic growing heterogeneous tumor with mild, gradually progressive enhancement.