[A Case of Lynch Syndrome with Repeated Asynchronous Colorectal Cancer in a Short Period].

This case was a 73-year-old woman who previously underwent a partial colectomy for ascending colon cancer at the age of 70. She had a history of cancer of the uterus, descending colon, bladder, and left ureter. She had a family history of colorectal cancer and met the Amsterdam Ⅱ criteria for Lynch syndrome. She was diagnosed as Lynch syndrome with a MSH2 germline mutation by genetic analysis. One year later, a partial colectomy was performed for sigmoid colon cancer. Six months later, colonofiberscopy revealed early-stage cancer in the rectum, and EMR was performed. Despite adequate surveillance, she had frequent recurrences of advanced colorectal cancer within a short period of time. We report here risk factors of colorectal cancer in Lynch syndrome and indications for prophylactic total colectomy.