title: Penile metastasis of sigmoid colon carcinoma: a rare case report.
abstract: BACKGROUND
  Metastasis to penis usually arises from genitourinary organs, but in rare cases, metastasis comes from the sigmoid colon. Furthermore, very few cases of penile metastasis of primary sigmoid colon carcinoma have been reported.
  
  
  METHODS
  We described a case of a 53-year-old man with penile metastasis of sigmoid colon carcinoma along with a review of the literature. Physical examination revealed two subcutaneous nodules on the glans penis. Biopsy of the nodules showed that penile metastasis of sigmoid colon carcinoma.
  
  
  CONCLUSIONS
  Metastasis of sigmoid colon carcinoma to the penis is extremely rare, which presents an advanced form of sigmoid colon carcinoma, therefore survival is extremely shortened. Although treatment of penile metastasis is almost always palliative, it is important to recognize this unusual manifestation so that timely appropriate treatment can be initiated. Early recognition may enhance survival rate of these patients.
authors.affiliation: Department of Dermatology, Zhongda Hospital, Southeast University, Nanjing, Jiangsu, 210009, China. dzb507@163.com.
authors.forename: Zhengbang
authors.initials: Z
authors.lastname: Dong
authors.affiliation: Department of Urology, First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, 210029, China. urology_qinchao@163.com.
authors.forename: Chao
authors.initials: C
authors.lastname: Qin
authors.affiliation: Department of Urology, First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, 210029, China. 15950537490@163.com.
authors.forename: Qijie
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: Department of Urology, First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, 210029, China. zldyxzl@sina.com.
authors.forename: Lei
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Department of Dermatology, Zhongda Hospital, Southeast University, Nanjing, Jiangsu, 210009, China. dryanghj@163.com.
authors.forename: Haijing
authors.initials: H
authors.lastname: Yang
authors.affiliation: Department of Dermatology, Zhongda Hospital, Southeast University, Nanjing, Jiangsu, 210009, China. dzhangjd@163.com.
authors.forename: Jingdong
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Department of Dermatology, Zhongda Hospital, Southeast University, Nanjing, Jiangsu, 210009, China. ffwangfei@163.com.
authors.forename: Fei
authors.initials: F
authors.lastname: Wang
mesh_terms: D000230:Adenocarcinoma / Q000473:pathology* / Q000556:secondary*; D003937:Diagnosis, Differential; D017809:Fatal Outcome; D006801:Humans; D008297:Male; D008875:Middle Aged; D010412:Penile Neoplasms / Q000473:pathology* / Q000556:secondary*; D035583:Rare Diseases / Q000473:pathology; D012811:Sigmoid Neoplasms / Q000473:pathology*