A case report of pneumo-retro-peritoneum: An unusual presentation of ischio-rectal abscess.

•Ischio-rectal abscess can present with abdominal symptoms of peritonism and peritonitis.•Actual cause of these symptoms of peritonitis could be retro-peritoneal air which can be managed simply by incision and drainage of abscess alone.•Vigilance on the part of treating surgeon/physician can avoid a negative laparotomy.