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Updated: Jan 26, 2026

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Published on: August 20, 2007
Brown bowel syndrome: a rare malnutrition-related complication of bariatric surgery
Pedro França da Costa Soares1, Rita Barbosa de Carvalho1, Elinton Adami Chaim1
1Department of Surgery. Faculty of Medical Sciences. Universidade Estadual de Campinas (UNICAMP).
Introduction:
Case report: we present the case of a 44-year-old male who presented with uncontrollable diarrhea, severe protein-calorie malnutrition and multiple vitamin deficiencies, along with peripheral neuropathy ten years after classic biliopancreatic diversion (BPD). He underwent nutritional support and had the surgery converted to a Roux-en-Y gastric bypass, with an uneventful outcome. The histopathology of the resected bowel revealed lipofuscinosis of the muscular layer compatible with brown bowel syndrome. Discussion: brown bowel syndrome is a rare complication of malnutrition that can be observed after BPD. It is associated with vitamin E deficiency. After recovery with nutritional support, a reoperation that elongates the common channel, and thus minimizes the degree of malabsorption, should be indicated in these cases.
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