Abstract
A 48-year-old woman visited a local physician with a chief complaint of bloody stool, and lower gastrointestinal endoscopy revealed a type II tumor in the sigmoid colon. The patient was diagnosed with well-differentiated adenocarcinoma based on the biopsy and referred to our hospital. Abdominal computed tomography (CT) showed a mass, 3 cm in diameter, in the medial segment (S4) of the liver, and a diagnosis of synchronous liver metastasis was made. Surgery consisting of sigmoidectomy and left lobectomy was performed. Histopathological findings included components of invasive micropapillary carcinoma (IMPC) at the site of invasion of the sigmoid colon cancer. IMPC is a new tissue type of invasive breast cancer that was proposed in 1993 by Siraunkgul et al., and it has recently been reported in other organs as well. Reports of colon cancer presenting with IMPC components are relatively rare, and the present case is described along with a review of the relevant literature.
