%0 Journal Article
%T Colon Metastasis From Microscopic Serous Carcinoma of the Fallopian Tube Fimbria Mimicking a Primary Colon Cancer
%A Genki Usui
%A Hajime Horiuchi
%A Hajime Tsunoda
%A Hirotsugu Hashimoto
%A Kentaro Nakajima
%A Masashi Kusakabe
%A Nobuyuki Matsuhashi
%A Teppei Morikawa
%A Yasushi Harihara
%A Yoshio Masuda
%J International Journal of Surgical Pathology
%@ 1940-2465
%D 2019
%R 10.1177/1066896918824028
%X 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 operatorĄ¯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 M¨šllerian 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
%K colorectal cancer
%K colonic metastasis
%K fallopian tube carcinoma
%K high-grade serous carcinoma
%K colonic biopsy
%K rectal cancer
%U https://journals.sagepub.com/doi/full/10.1177/1066896918824028