Colon Metastasis From Microscopic Serous Carcinoma of the Fallopian Tube Fimbria Mimicking a Primary Colon Cancer. (June 2019)

• Record Type: Journal Article
• Authors: Usui, Genki; Masuda, Yoshio; Hashimoto, Hirotsugu; Kusakabe, Masashi; Nakajima, Kentaro; Tsunoda, Hajime; Matsuhashi, Nobuyuki; Harihara, Yasushi; Horiuchi, Hajime; Morikawa, Teppei
• Is Part Of: International journal of surgical pathology. Volume 27:Number 4(2019)
• Page Start: 390
• Page End: 395
• Publication Date: 2019-06
• Subjects: colorectal cancer -- colonic metastasis -- fallopian tube carcinoma -- high-grade serous carcinoma -- colonic biopsy -- rectal cancer; Pathology, Surgical -- Periodicals; 617.07
• DOI: 10.1177/1066896918824028
• Languages: English
• ISSNs: 1066-8969

Abstract

Metastatic diseases rarely develop in the colorectum, and diagnosing colorectal metastasis by biopsy without history of a malignant tumor or clinical information of a primary tumor is challenging. A 65-year-old woman with a 6-month history of constipation and diarrhea was admitted to our hospital and diagnosed with rectosigmoid colonic micropapillary carcinoma. Low anterior resection was performed after neoadjuvant chemotherapy. Because the lipoleiomyoma in the uterus obstructed the operator's vision, total hysterectomy and bilateral salpingo-oophorectomy were performed. Examination of the colon and adnexa, together with immunohistochemical studies, revealed that the colonic tumor was actually serous carcinoma that had metastasized from the left fimbria of the fallopian tube. Retrospective immunohistochemical examination of the colon biopsy specimen suggested carcinoma with a Müllerian immunophenotype. When a colon biopsy reveals carcinoma with an invasive micropapillary pattern without a component of conventional tubular adenocarcinoma, immunohistochemical examination should be performed to rule out the possibility of metastasis.