Abstract
A 39-year-old woman who had abdominal pain and was found to have an approximately 8-cm cystic lesion on the mesenteric side of the ascending colon extending to the intra- and extraluminal sides on CT examination at the previous hospital was admitted to our hospital. Barium enema revealed a diverticular structure on the wall of the mesenteric side of the ascending colon. Due to the lack of symptoms and the decrease in the size of the lesion, she underwent follow-up with imaging examinations at our outpatient department. Two years later, she felt abdominal pain again and underwent examination at our hospital. CT examination revealed that the lesion had become larger, extending to the intraluminal side and causing stenosis of the ascending colon. As we could rule out the possibility of a malignant tumor, we performed ileocecal resection for histological diagnosis and relief from symptoms. Histological examination revealed that the cystic lesion was overlaid by the mucosal epithelium, had a smooth muscular layer and had no lumen connecting it to the ascending colon. We finally diagnosed the patient with colonic duplication with a round and non-continuous pattern. The characteristics and impressive imaging findings may be useful for the diagnosis of non-continuous colonic duplication.
