Abstract
Adenomyoma is a rare, benign lesion which has previously been described more commonly occurring in the stomach and adjacent to the ampulla. Cases that have occurred in the jejunum and ileum have been reported more frequently in the paediatric population as a cause of intussusception or an incidental finding. A segment of small bowel was received in our laboratory from a 27-year-old female with known malrotation of the small bowel. Macroscopically there was a linear area of ulceration within the mucosa and adjacent to this was a raised, firm, polypoid area. Histology showed raised undulating epithelium with dilated disorganised glands surrounded by bundles of smooth muscle within the mucosa and submucosa. The glandular elements were positive for CK7 and negative for CK20 and CDX-2. These features were consistent with the diagnosis of adenomyoma. We present this unusual case of adenomyoma incidentally found within jejunum in a patient with congenital mal-rotation. The immunohistochemical features are discussed with the aim to increase awareness of this benign lesion.
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