Idiopathic sclerosing encapsulating peritonitis presenting as a right iliac fossa mass in a teenaged girl

An intraoperative diagnosis of sclerosing encapsulating peritonitis: a case report

Primary sclerosing encapsulating peritonitis (SEP) is an idiopathic and rare condition characterized by chronic peritoneal inflammation. We describe the case of an intraoperative diagnosis of SEP, presenting as a mimicker of small bowel obstruction. The patient was a 59-year-old male with suspected small bowel obstruction. On exploratory laparotomy, it was noted that there was thick fibrous tissue involving the visceral and parietal peritoneum enveloping grossly dilated loops of small bowel. This case reports on the histopathological features of peritoneal biopsies as well as radiological findings. There is no consensus regarding the standard management for idiopathic SEP. The present case demonstrates a significant improvement in the patient’s condition with conservative management alone. A critical teaching point is that in the absence of an obvious cause, SEP is a rare but important differential diagnosis for surgeons to consider in the context of recurrent bowel obstruction.