We reported a case of rectal gastrointestinal stromal tumor(GIST)performed transanal surgery. A 46-year-old woman was pointed out uterinal cancer and lower rectal GIST. After operation for uterine cancer, GIST was treated. Because of the patent's opinion for anal preservation, chemotherapy with imatinib for 3 months was performed and local resection was done by transanal minimally invasive surgery(TAMIS). The histopathological diagnosis was low-grade GIST and immunostaining showed the tumor was positive for c-kit, CD34, DOG-1 and α-SMA. Because capsule of the GIST was damaged intraoperatively, imatinib therapy was started and she has no recurrence after 2 years.
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