870 Benign Cystic Mesothelioma- a Rare Intra-Abdominal Tumour

Abstract

Abstract Introduction Benign cystic mesothelioma is a rare intra-abdominal tumour affects primarily women who are in reproductive. Since this pathology has a rare occurrence, a similar presentation, and similar imaging features, the diagnosis is based on histologic findings and there is no current standard treatment for this condition. Presentation of case In this case report, a 40-year-old female patient presented in the Emergency Department with a five-day history of right-sided, migratory, abdominal pain. She was systemically well, and her inflammatory markers were unremarkable. The patient was investigated for appendicitis, with a CT scan showing a multi-loculated cystic structure below the liver. Her case was discussed with the Basingstoke Peritoneal Malignancy Institute who felt this may demonstrate benign cystic peritoneal mesothelioma. As per their advice, and the thoughts of the local MDT team, the patient underwent a diagnostic laparoscopy, and the cystic mass was removed. The diagnosis of benign cystic peritoneal mesothelioma was then confirmed by histology. Discussion Based on literature, this is a rare and asymptomatic form of mesothelioma.Imaging is able to provide suspicion of this type of benign mesothelium, but only histological examination can provide a definitive diagnosis. Additionally, on review there are no guidelines regarding management and no standard treatment for this condition. The only effective treatment for a benign cystic mesothelioma is surgery, but no evidence-based strategies exist. Conclusions It is critical to publish more case reports on this condition once it is diagnosed in order to formulate guidelines and to advance towards a possible effective treatment solution.