Gastrointestinal cancer

Gastrointestinal carcinoma: colorectal cancer is the second most common primary tumor and is also the visceral tumor that most frequently metastasizes to the skin. It most commonly occurs in the rectum, accounting for 11% to 19% of skin metastases in men and 1.3% to 9% in women. Colorectal cancer is usually detected before cutaneous metastases. Cutaneous metastases from the gallbladder and bile ducts may be found at the time the primary tumor is discovered, or as late as 40 years after resection of the primary tumor. Cutaneous metastases from the stomach and pancreas usually occur before the primary tumor is discovered. Cutaneous metastases from the gastrointestinal tract usually occur on the abdominal wall, perineum, and umbilicus.