Clinical outcomes of gastrointestinal stromal tumor in southern Thailand

Figure 2 Abdominal computerized tomography and histopathological pictures of a 68-year-old male patient who presented with abdominal mass. A: Computerized tomography (CT) shows a large enhancing solid mass (T), measuring 11.2 cm × 11.9 cm × 10.7 cm, occupying the left upper quadrant between the stomach and the spleen. A liver nodule is also visible in segment IV; B: Forty months following the beginning of imatinib therapy, a follow-up CT showed partial tumor response; C, D: Image-guided tissue biopsy revealed a spindle cell tumor (arrows) that marked CD117. The mitotic cell count was 2 cells/50 high power fields; E, F: Following an en bloc resection including a total removal of the stomach together with the spleen and a wedge resection of hepatic metastasis, the pathological tissue showed only a stromal hyalinization and dystrophic calcification with a scanty number of differentiated spindle cells that marked S-100, but not CD117.