title: Renal carcinoid tumor with liver metastasis followed up postoperatively for 9 years.
abstract: BACKGROUND
  We describe a case of renal carcinoid tumor with liver metastasis followed up postoperatively for 9 years.
  
  
  METHODS
  A 33-year-old man presented with left flank dull ache. On the abdominal computed tomography, a solid renal mass in the upper portion of the left kidney was detected. The patient had no other abnormal findings, such as suspected distant metastasis or lymph node metastasis. Radical nephrectomy was performed on 14/9/2005. Histological examination and immunohistochemical staining confirm primary renal carcinoid tumor. 9 years after radical nephrectomy, computed tomography of the abdomen demonstrated a 2 cm × 1.8 cm cyst mass in the right liver. Similar pathologic characteristics were found between the renal carcinoid tumor and liver tumor.
  
  
  CONCLUSIONS
  We present a primary renal carcinoid tumor with liver metastasis 9 years after radical nephrectomy. With literature review, renal carcinoid tumors exhibit heterogenous behavior.
authors.affiliation: Department of Pathology, Shanghai Chang Zheng Hospital, The Second Military Medical University, Shanghai, China. ouyangbinshen@aliyun.com.
authors.forename: BinShen
authors.initials: B
authors.lastname: Ouyang
authors.affiliation: Department of Pathology, Shanghai Chang Zheng Hospital, The Second Military Medical University, Shanghai, China. maxiaomei2001@126.com.
authors.forename: XiaoMei
authors.initials: X
authors.lastname: Ma
authors.affiliation: Department of Pathology, Shanghai Chang Zheng Hospital, The Second Military Medical University, Shanghai, China. yanhongzhu2012@163.com.
authors.forename: HongZhu
authors.initials: H
authors.lastname: Yan
authors.affiliation: Department of Pathology, Shanghai Chang Zheng Hospital, The Second Military Medical University, Shanghai, China. hejincz@163.com.
authors.forename: Jin
authors.initials: J
authors.lastname: He
authors.affiliation: Department of Pathology, Shanghai Chang Zheng Hospital, The Second Military Medical University, Shanghai, China. xiacysq@163.com.
authors.forename: ChunYan
authors.initials: C
authors.lastname: Xia
authors.affiliation: Department of Pathology, Shanghai Chang Zheng Hospital, The Second Military Medical University, Shanghai, China. yuhongyu795@hotmail.com.
authors.forename: HongYu
authors.initials: H
authors.lastname: Yu
mesh_terms: D000328:Adult; D014408:Biomarkers, Tumor / Q000032:analysis; D001706:Biopsy; D002276:Carcinoid Tumor / Q000737:chemistry / Q000556:secondary* / Q000601:surgery*; D006801:Humans; D007150:Immunohistochemistry; D007680:Kidney Neoplasms / Q000737:chemistry / Q000473:pathology* / Q000601:surgery*; D008113:Liver Neoplasms / Q000737:chemistry / Q000556:secondary*; D008297:Male; D009392:Nephrectomy; D013997:Time Factors; D016896:Treatment Outcome
chemical_list: D014408:Biomarkers, Tumor