Incidental Finding of Peritoneal Mesothelioma in Recurrent Diverticulitis with A Large Sigmoid Diverticulum

Abstract

Mesothelioma is a rare type of tumour arising from the lining of cavities such as the pleura, peritoneum, pericardium or the tunica vaginalis. It is well known that the leading cause for this tumour type is secondary to asbestos exposure. In this case report, we present a 78-year-old male who was admitted to the hospital a presumed recurrent diverticulitis based on a computed tomography (CT) finding of a large sigmoid diverticulum and associated fat stranding. The patient underwent inpatient laparoscopic sigmoid colectomy which revealed peritoneal mesothelioma on histopathology. He was referred to a colorectal unit in a quaternary cancer centre for further management. Our case represents a challenging clinical presentation of peritoneal mesothelioma due to non-specific symptoms and its rarity.