PMC5120263_01
Microscopic analysis of the rectal GIST. Tumor cells are spindled, forming fascicles with increased mitotic rate.
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Pathology of the surgical specimen revealed a gastrointestinal stromal tumor 2.8 cm in greatest extent, 80-90% hyalinization with scarce cellularity (Fig. 1, Fig. 2).
Axial view of pelvis MRI. Axial view of the pelvis on MRI revealed a right corpus cavernosum mass.
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A pelvic MRI revealed an 8.4 x 4.3 x 3.6 cm enhancing mass in the right corpus cavernosum (Fig. 3, Fig. 4).
Axial view of follow-up MRI. MRI of the pelvis obtained four months after resuming imatinib demonstrated decrease in the size of the right corpus cavernosum mass from 8.4 x 4.3 x 3.6 cm to 4.9 x 1.8 x 1.5 cm.
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Four months after resuming imatinib, an MRI of the pelvis demonstrated that the metastatic penile lesion had decreased in size (Fig. 5).