Abstract
The patient is a 13-years-old girl and her lip has a melanine pigmentation. In September, 1989, when she was 9-years-old, she had the first gastrointestinal examinationbecause her mother died of a carcinoma in the colon due to Peutz-Jeghers syndrome. Sincethe gastrointestinal X-ray examination revealed a few polyps in the stomach, she wasdiagnosed Peutz-Jeghers syndrome. In August, 1992, she had a polypectomy of a pedun-cu.lated polyp, 3cm in size, in the lower portion of the discendlng colon. Its histopatho-logical diagnosis was hamartoma. However 7 months later, a subpedunculated polyp(about 1 cm)grew at the almost same position previously polypectomized. After 5 monthslater, this polyp grew to be 1.5cm. Further 7 months later, this polyp rapidly grew td be4cm. Then she vvas admitted to our hospital and had partial colectomy in April, 1994. Inthis case the doubling time of the polyp was 110.3days according to the Collins'equation.
