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Fibromatosis is an important diagnosis to consider when evaluating locally aggressive spinal lesions at sites of prior operative repair. Molecular and genetic studies pertaining to the role of mesenchymal stem cells and β-catenin in the pathogenesis of aggressive fibromatosis tumors could lead to possible worthwhile treatment strategies in the future.

CASE SUMMARY: An otherwise healthy 59-year-old man presented to the emergency department with 2 weeks of narrowed stools, 5 days of obstipation, and 1 day of abdominal pain, nausea, and vomiting. Computed tomography revealed an obstructing sigmoid mass without evidence of metastatic disease, and the CEA was 1.2 ng/mL. Flexible sigmoidoscopy confirmed a circumferentially obstructing distal sigmoid neoplasm. Endoscopic stent placement was immediately followed by a firm distended abdomen. An upright radiograph obtained following the procedure demonstrated free intraperitoneal air. An emergent Hartmann procedure was performed for iatrogenic colon perforation in a patient with malignant obstruction and chronic dilation of the proximal colon.

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