title: Accessory liver lobe attached to the gallbladder wall preoperatively detected by ultrasonography: A case report.
abstract: BACKGROUND
  An accessory liver lobe is a rare developmental abnormality, which is often not diagnosed preoperatively, and is usually detected incidentally during abdominal surgery. This condition is often asymptomatic; here, we report on a case where the accessory liver lobe was diagnosed preoperatively using ultrasonography.
  
  
  METHODS
  A 59-year-old woman presented to our hospital with right upper abdominal pain. An abdominal ultrasonography indicated the presence of gallbladder debris and an accessory liver lobe. She underwent laparoscopic cholecystectomy and resection of the accessory liver lobe without any complications.
  
  
  CONCLUSIONS
  An accessory liver lobe is a rare anomaly of the liver. It is typically asymptomatic and is detected incidentally during surgery or autopsy in most cases. However, we diagnosed the accessory liver lobe using ultrasonography. An accessory liver lobe can occasionally result in complications, such as bleeding, portal vein obstruction, or malignant transformation to hepatocellular carcinoma.
  
  
  CONCLUSIONS
  An accessory liver lobe should be resected to prevent complications and malignant transformation. Ultrasonography is useful for preoperative diagnosis in cases with an accessory liver lobe.
authors: Department of Surgery, Yotsukaido Tokushukai Hospital, Chiba, Japan. Electronic address: sgitou@juntendo.ac.jp.
authors: Shingo
authors: S
authors: Ito
authors: Department of Surgery, Yotsukaido Tokushukai Hospital, Chiba, Japan. Electronic address: daityokomon@yahoo.co.jp.
authors: Ryohei
authors: R
authors: Takeda
authors: Department of Surgery, Yotsukaido Tokushukai Hospital, Chiba, Japan. Electronic address: kokubowl@yahoo.co.jp.
authors: Ritsuo
authors: R
authors: Kokubo
authors: Department of Coloproctological Surgery, Juntendo University Faculty of Medicine, Tokyo, Japan. Electronic address: yutachan@juntendo.ac.jp.
authors: Yutaka
authors: Y
authors: Kojima
authors: Department of Coloproctological Surgery, Juntendo University Faculty of Medicine, Tokyo, Japan. Electronic address: m-goto@juntendo.ac.jp.
authors: Michitoshi
authors: M
authors: Goto
authors: Department of Coloproctological Surgery, Juntendo University Faculty of Medicine, Tokyo, Japan. Electronic address: tomiki@juntendo.ac.jp.
authors: Yuichi
authors: Y
authors: Tomiki
authors: Department of Coloproctological Surgery, Juntendo University Faculty of Medicine, Tokyo, Japan. Electronic address: kazusaka@juntendo.ac.jp.
authors: Kazuhiro
authors: K
authors: Sakamoto
keywords: Accessory liver lobe; Laparoscopic cholecystectomy; Ultrasonography