title: Laparoscopic resection of a hepatic mucinous cystic neoplasm: A case report.
abstract: BACKGROUND
  We aimed to present a case of hepatic mucinous cystic neoplasm (MCN-H) that was completely resected by laparoscopy.
  
  
  METHODS
  A 47-year-old female exhibited mild elevation of serum liver enzyme levels. Abdominal computed tomography revealed a 45-mm multilocular cystic tumor in segment IV of the liver, along with intermittent border calcification and minimal wall thickness. Magnetic resonance imaging revealed fluid-to-fluid level in the cystic tumor, thereby increasing the suspicion of a mild hemorrhage. The patient underwent laparoscopic liver resection (LLR) with a diagnosis of suspected mucinous cystic neoplasm of the liver. The entire tumor was successfully resected with a laparoscopic approach. The resected specimen was a 4.2×3.3×2.2-cm cystic tumor. Histological findings revealed mucin-producing singular epithelium and ovarian-like stroma. The tumor was diagnosed as a MCN-H with no malignancy.
  
  
  CONCLUSIONS
  This is the first report in which a MCN-H was completely resected by laparoscopy. MCN-H is rare and is observed in only<5% of liver cystic tumors. MCN-H has been reported to have the malignant potential. And complete resection might be a good treatment option. Along with technical development, LLR has been indicated for benign liver tumors to date. Benign liver tumors are commonly observed in young females. The smaller incisions of the laparoscopic approach might provide cosmetic advantages for patients.
  
  
  CONCLUSIONS
  We presented the first case of a MCN-H completely resected by laparoscopy. Benign tumors and tumors with malignant potential might be good indications for a laparoscopic surgery.
authors.affiliation: Department of Surgery, Nara Medical University, 840 Shijo-cho, Kashihara-shi, 634-8522 Nara, Japan.
authors.forename: Shinsaku
authors.initials: S
authors.lastname: Obara
authors.affiliation: Department of Surgery, Nara Medical University, 840 Shijo-cho, Kashihara-shi, 634-8522 Nara, Japan. Electronic address: t.nomi45@gmail.com.
authors.forename: Takeo
authors.initials: T
authors.lastname: Nomi
authors.affiliation: Department of Surgery, Nara Medical University, 840 Shijo-cho, Kashihara-shi, 634-8522 Nara, Japan.
authors.forename: Ichiro
authors.initials: I
authors.lastname: Yamato
authors.affiliation: Department of Surgery, Nara Medical University, 840 Shijo-cho, Kashihara-shi, 634-8522 Nara, Japan.
authors.forename: Daisuke
authors.initials: D
authors.lastname: Hokuto
authors.affiliation: Department of Surgery, Nara Medical University, 840 Shijo-cho, Kashihara-shi, 634-8522 Nara, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Yasuda
authors.affiliation: Department of Surgery, Nara Medical University, 840 Shijo-cho, Kashihara-shi, 634-8522 Nara, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Nishiwada
authors.affiliation: Department of Surgery, Nara Medical University, 840 Shijo-cho, Kashihara-shi, 634-8522 Nara, Japan.
authors.forename: Chihiro
authors.initials: C
authors.lastname: Kawaguchi
authors.affiliation: Department of Surgery, Nara Medical University, 840 Shijo-cho, Kashihara-shi, 634-8522 Nara, Japan.
authors.forename: Takahiro
authors.initials: T
authors.lastname: Yoshikawa
authors.affiliation: Department of Surgery, Nara Medical University, 840 Shijo-cho, Kashihara-shi, 634-8522 Nara, Japan.
authors.forename: Takatsugu
authors.initials: T
authors.lastname: Yamada
authors.affiliation: Department of Surgery, Nara Medical University, 840 Shijo-cho, Kashihara-shi, 634-8522 Nara, Japan.
authors.forename: Hiromichi
authors.initials: H
authors.lastname: Kanehiro
authors.affiliation: Department of Surgery, Nara Medical University, 840 Shijo-cho, Kashihara-shi, 634-8522 Nara, Japan.
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Nakajima
keywords: Case report; Laparoscopic liver resection; Liver; Mucinous cystic neoplasm; Ovarian-like stroma