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The Kock continent ileostomy (KCI) was designed by Nik Kock, who used an intussuscepted ileostomy loop to create a nipple valve ([Fig. 1]) that would not leak and would allow ileal effluent to be evacuated with a catheter [1]. Enterolith formation is a rarely reported long-term complication of KCI that can lead to disabling symptoms mandating treatment [2] [3] [4]. Zoom ImageZoom Image Fig. 1 Schematic representation of a Kock continent ileostomy. We report the case of a 65-year-old woman who underwent total proctocolectomy and subsequent construction of a KCI when she was 31 years of age. The procedure was done to treat ulcerative pancolitis complicated by colon cancer. She had a well-functioning KCI that she had catheterized daily for 34 years before she presented with intermittent abdominal pain and occasional bleeding from the stoma, and she reported having difficulty catheterizing her ileostomy. Computed tomography and ileoscopy demonstrated three oval enteroliths in the pouch and a lipoma in the efferent loop of the KCI ([Fig. 2]). The patient’s symptoms decreased after resection of the lipoma with a snare cautery. However, similar symptoms recurred 2 years later. A second ileoscopy showed a narrowed efferent loop that was dilated by insertion of the colonoscope, with successful relief of her symptoms. Chemical analysis of one of the retrieved enteroliths revealed calcium oxalate crystals. Five cases have previously been noted in the literature ([Table 1]).

Enteroliths in a Kock continent ileostomy: case report and review of the literature