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A 57-year-old man is found to have a submucosal mass in the distal rectum on colonoscopy. Biopsy reveals spindle cells which stain positive for CD117 on immunohistochemistry. The lesion is posterior and 5 cm from the anal verge on rigid proctoscopy. Magnetic resonance imaging measures the size of the lesion as 1.3 cm with extension into the muscularis propria. What is the appropriate treatment?

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