Fig. 1. Onychodystrophy of the Case 1 patient’s fingernails.

Fig. 2. Endoscopic findings of the Case 1 patient’s gastrointestinal tract. (A) Numerous erythematous polyps in the stomach. (B) Numerous erythematous polyps in the colon. (C) Atrophied villi in the duodenum. (D) Atrophied villi in the terminal ileum.

Fig. 3. Follow-up endoscopic findings of the Case 1 patient’s gastrointestinal tract. (A) Most of the polyps in the stomach disappeared on follow-up endoscopy. (B) Most of the polyps in the colon disappeared on follow-up endoscopy.

Fig. 4. Onychodystrophy of the Case 2 patient’s fingernails.

Fig. 5. Endoscopic findings of the Case 2 patient’s gastrointestinal tract. (A) Numerous erythematous polyps in the stomach. (B) Numerous erythematous polyps in the colon. (C) Atrophied villi in the duodenum. (D) Dilated villi in the terminal ileum.