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A solitary Peutz-Jeghers-type hamartomatous polyp in the duodenum is rare,and few reports have described its characteristic endoscopic features.We describe three cases of solitary Peutz-Jeghers-type hamartomatous polyp and their endoscopic findings in detail.The polyp in all of our three cases showed an irregularly Iobular or nodular surface,whereas adenomas often show a regularly nodular or granular surface.The color of the polyp was whitish in all of our cases.In the present cases,close observation by endoscopy revealed that the solitary Peutz-Jeghers-type hamartomatous polyps looked whitish because of the presence of diffusely scattered white spots on the surface of the polyps.Duodenal polyps that exhibit the aforementioned endoscopic characteristics may be diagnosed as Peutz-Jeghers-type hamartomatous polyps and treated by polypectomy because of the malignant potential.