title: Focal nodular hyperplasia of the liver in 86 patients.
abstract: BACKGROUND
  Focal nodular hyperplasia (FNH), the second most common benign hepatic tumor after hemangioma, is characterized by a stellate central scar and hyperplastic nodules. Although some large FNH may be associated with significant symptoms, more frequently they are discovered incidentally on physical examination or the work-up of unrelated symptoms. Since its nature and pathogenesis are still controversial, accurate diagnosis of FNH based on clinical presentation and radiographic studies is difficult. The purpose of this study was to explore the diagnosis and treatment of FNH.
  
  
  METHODS
  Eighty-six FNH patients confirmed pathologically were treated at the Liver Cancer Institute in our hospital from 1996 to 2006. Their clinical manifestations, imaging presentation, pathological findings, and surgical results were analyzed retrospectively.
  
  
  RESULTS
  Of the 86 patients with 99 foci, 54 were male and 32 female, with a mean age of 37 years. Eighty patients had a single solitary focus and 6 had multiple foci. Tumor diameter was less than 5 cm in 69 patients, 5-10 cm in 15, and more than 10 cm in 2. The overall rate of correct preoperative diagnosis was 59.3% (51/86) including 32.9% (26/79) by color Doppler flow imaging (CDFI), 60.3% (35/58) by CT, and 77.4% (24/31) by MRI. All the 86 patients underwent resection with good curative effect.
  
  
  CONCLUSIONS
  CT and MRI are important diagnostic methods for FNH but it is difficult to make a definite preoperative diagnosis for partial classical and all non-classical FNH patients. We suggest that patients with clinical symptoms or with indefinite diagnosis should accept surgical removal.
authors.affiliation: Department of Liver Surgery & Liver Cancer Institute, Zhongshan Hospital, Fudan University, Shanghai 200032, China. yinghaoshen@yahoo.com.cn
authors.forename: Ying-Hao
authors.initials: YH
authors.lastname: Shen
authors.forename: Jia
authors.initials: J
authors.lastname: Fan
authors.forename: Zhi-Quan
authors.initials: ZQ
authors.lastname: Wu
authors.forename: Zeng-Chen
authors.initials: ZC
authors.lastname: Ma
authors.forename: Xin-Da
authors.initials: XD
authors.lastname: Zhou
authors.forename: Jian
authors.initials: J
authors.lastname: Zhou
authors.forename: Shuang-Jian
authors.initials: SJ
authors.lastname: Qiu
authors.forename: Lun-Xiu
authors.initials: LX
authors.lastname: Qin
authors.forename: Qin-Hai
authors.initials: QH
authors.lastname: Ye
authors.forename: Hui-Chuan
authors.initials: HC
authors.lastname: Sun
authors.forename: Xiao-Wu
authors.initials: XW
authors.lastname: Huang
authors.forename: Zhao-You
authors.initials: ZY
authors.lastname: Tang
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D005260:Female; D020518:Focal Nodular Hyperplasia / Q000175:diagnosis* / Q000601:surgery*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies