Colon cancer with rapid growth in 16 months confirmed by computed tomographic colonography.

This report describes a case of rapidly growing colon cancer confirmed by computed tomographic colonography (CTC). A 75-year-old woman presented at our clinic with complaints of abdominal discomfort and melena. Colorectal examination was performed via CTC. The findings were normal. Sixteen months later, she was referred to our clinic again for positive findings on a faecal immunochemical screening test. A repeat CTC was performed, which revealed a 3 cm ulcerated tumour at the ascending colon. Colonoscopy with biopsy revealed tubular adenocarcinoma. Laparoscopic right hemicolectomy was performed and the TNM classification was found to be T3N1M0. The postoperative course was uneventful, and the cancer has not recurred for 2.5 years.