A Malignant Gastrointestinal Stromal Tumor of the Gallbladder Immunoreactive for PDGFRA and Negative for CD 117 Antigen (c-KIT)
Figure 1
(a) Spindle shaped tumor cells arranged in a short fascicle pattern (HE staining ×200). (b) Tumor cells are diffusely immune-positive for PDGFRA (×200).
