Heavily calcified gastrointestinal stromal tumors: Pathophysiology and implications of a rare clinicopathologic entity

Figure 1 Axial contrast-enhanced computed tomography scan showing a well-defined heterogeneously enhanced gastric mass with coarse and diffuse calcifications.

Figure 2 Macroscopic presentation of the resected mass, consisting of an exophytic and yellowish-gray tumor.

Figure 3 Histologic appearance of the tumor. A and B: Interlacing bundles of spindle cells with unremarkable mitotic activity (H and E stain; magnification × 10); C and D: Calcified areas (H and E stain; magnification × 20); E: Intense immunoreactivity for DOG1 (Immunohistochemistry stain; magnification × 20); F: Inconspicuous Ki67-MIB1 label index (count rate < 1%; immunohistochemistry stain; magnification × 20).