Assessment of gastrointestinal stromal tumors with computed tomography following treatment with imatinib mesylate

Figure 2 GP pattern. Contrast-enhanced CT of abdomen obtained from a 55-year-old man with metastatic GIST in the mesentery. A: Before imatinib treatment, there were mesenteric masses (arrows); B: After 2 mo therapy, there was interval progression in both mesenteric masses, as demonstrated by increased tumor size and thickness of the enhancing wall (arrows).