© Georg Thieme Verlag KG Stuttgart · New York
Pyogenic granuloma of the descending colon
24 October 2007 (online)
A 59-year-old woman who was known to have large hepatic cysts presented with a positive fecal occult blood test. Her physical examination was unremarkable, and laboratory testing revealed no abnormalities. A double-contrast barium study showed a round, radiolucent area in the descending colon. Colonoscopy revealed a light-red, sessile lesion, about 15 mm in diameter, which consisted of variously-sized nodules covered with white exudate ([Fig. 1]). The rest of the colonic mucosa was unremarkable. When the specimen was biopsied massive bleeding occurred, suggesting that the lesion was hypervascular. Histological examination of the biopsy specimen showed proliferation of capillaries.
Fig. 1 Conventional colonoscopy revealed a light-red, sessile lesion, about 15 mm in diameter, which consisted of nodules of various sizes and which was covered with white exudate.
The lesion was resected and the large hepatic cysts were drained during the same laparoscopic procedure. Histologically, the surface was found to be covered by foci of regenerating epithelium ([Fig. 2]). High-power magnification showed that the tumor was composed of numerous capillaries which were lined with plump endothelial cells, with an edematous stroma containing acute and chronic inflammatory cell infiltrates ([Fig. 3]). There were also so-called “satellite” lesions  in the muscularis propria layer and in the subserosa ([Fig. 4]). On the basis of these findings, the tumor was diagnosed as a pyogenic granuloma. One year later, no evidence of recurrence was found on follow-up colonoscopy, and she reported no gastrointestinal symptoms.
Fig. 2 Histologically, the surface of the colonic lesion was covered by foci of regenerating epithelium.
Fig. 3 High-power magnification showed that the tumor was composed of numerous capillaries which were lined with plump endothelial cells, with an edematous stroma containing acute and chronic inflammatory cell infiltrates.
Fig. 4 A satellite lesion was found in the subserosal layer.
Pyogenic granuloma is a benign lesion, although recurrence has been reported . It occurs extremely rarely in the gastrointestinal tract, and only 20 cases have been reported in the literature   . With respect to treatment, both surgical and endoscopic resection methods have been described. Because this patient also required treatment for her large hepatic cysts, laparoscopic resection was the best option in this case. To our knowledge, this is the first report of pygenic granuloma in the descending colon and the case is also notable in that it was associated with satellite lesions.
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T. Tokunaga, MD