CASE REPORTS
Mesothelial reaction in longstanding Crohns ileitis simulating papillary mesothelioma
University Hospital of North Durham, North Road, Durham, UK
Correspondence to:
Dr L Wilkinson, Department of Histopathology, University Hospital of North Durham, Durham DH1 5TW, UK; lsarkar{at}talk21.com
Intestinal and extraintestinal complications of Crohns disease are well documented. Changes in the connective tissue within the intestinal wall and surrounding tissue including mesenteric fat are characteristically seen in resected and autopsy specimens. A rare and unusually florid mesothelial reaction in the surrounding small bowel serosa of a patient with a 2-year history of Crohns ileitis is described. The peritoneal surface of the ileal resection specimen displayed exuberant tubulo-papillary formations of the mesothelium, with superficial invasion of the underlying stroma. The case demonstrates the well-recognised difficult differential diagnosis between a benign mesothelial proliferation and malignant mesothelioma in a novel clinical setting, and the diversity of the extramural manifestations of Crohn's disease.
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