title: Pneumoperitoneum in a non-acute abdomen-pneumatosis cystoides intestinalis.
abstract: OBJECTIVE
  The aim of this study is to increase the understanding of pneumatosis cystoides intestinalis (PCI) and its incidents.
  
  
  METHODS
  We report here a case of PCI in an 88-year-old man with a provisional diagnosis of perforated viscus and possible ischaemic bowels based on CT findings of pneumoperitoneum. The patient was found to have extensive PCI on his small bowels. We then systematically search the PubMed database for case reports for articles containing 'pneumatosis intestinalis' in their titles or key words.
  
  
  RESULTS
  The study group consisted of 52 cases on PCI from the period of 2010-2014 with the focus on the adult population. The youngest patient was 18 years old and the oldest was 91 years old. The mean age was 60.4 years (range, 18-91 years old). There were 27 (52 %) females and 25 (48 %) males. The most common symptoms were abdominal pain (79 %) followed by nausea/vomiting (27 %) and abdominal distension (19 %). CT imaging was the most common investigation modality used (94 %). Three (6 %) of the patients had laparoscopic treatment while 20 (38 %) had laparotomy. Thirty-six (69 %) of them recovered uneventfully while 9 (17 %) of the patients died.
  
  
  CONCLUSIONS
  Although there have been more case reports published on PCI in the recent years, the understanding of this condition remains in the infancy stage. PCI can be difficult to diagnose and can be easily misdiagnosed as pneumoperitoneum in an acute abdomen. Often it is identified incidentally during operation. Asymptomatic PCI should be treated conservatively, while emergency laparotomy should be reserved for life threatening abdominal pathology.
authors.affiliation: Liverpool Hospital, Elizabeth Street, Liverpool, NSW, 2170, Australia. smso562@uowmail.edu.au.
authors.forename: Siang Mei Sally
authors.initials: SM
authors.lastname: Ooi
keywords: Bowel dilatation; Bowel perforation; Extra-luminal gas; Intestinal cysts; Pneumatosis cystoides intestinalis; Pneumoperitoneum