title: Microwave ablation of liver metastasis complicated by Clostridium perfringens gas-forming pyogenic liver abscess (GPLA) in a patient with past gastrectomy.
abstract: BACKGROUND
  Gas-forming pyogenic liver abscess (GPLA) caused by C. perfringens is rare but fatal. Patients with past gastrectomy may be prone to such infection post-ablation.
  
  
  METHODS
  An 84-year-old male patient with past gastrectomy had MW ablation of his liver tumors complicated by GPLA. Computerised tomography scan showed gas-containing abscess in the liver and he was managed successfully with antibiotic and percutaneous drainage of the abscess.
  
  
  CONCLUSIONS
  C. perfringens GPLA secondary to MW ablation in a patient with previous gastrectomy has not been reported in the literature. Gastrectomy may predispose to such infection. Even in high-risk patients, empirical antibiotic before ablation is not a standard of practice. Therefore following the procedure, close observation of patients' conditions is necessary to allow early diagnosis and intervention that will prevent progression of infection.
  
  
  CONCLUSIONS
  Potential complication of liver abscess following MW ablation can never be overlooked. The risk may be enhanced in patients with previous gastrectomy. Early diagnosis and management may minimise mortality and morbidity.
authors.affiliation: St. George Clinical School, University of New South Wales, New South Wales, Australia.
authors.forename: Lee S
authors.initials: LS
authors.lastname: Kyang
authors.affiliation: Department of Surgery, St. George Hospital, University of New South Wales, Sydney, New South Wales, Australia.
authors.forename: Thamer A
authors.initials: TA
authors.lastname: Bin Traiki
authors.affiliation: Department of Surgery, St. George Hospital, University of New South Wales, Sydney, New South Wales, Australia; Imam Muhammad ibn Saud Islamic University College of Medicine, Riyadh, Saudi Arabia.
authors.forename: Nayef A
authors.initials: NA
authors.lastname: Alzahrani
authors.affiliation: Department of Surgery, St. George Hospital, University of New South Wales, Sydney, New South Wales, Australia. Electronic address: frank.ls01@hotmail.com.
authors.forename: David L
authors.initials: DL
authors.lastname: Morris
keywords: Clostridium perfringens infection; Gas-containing abscess; Gastrectomy; Liver tumor; Microwave ablation; Prophylactic antibiotic