Pseudomyxoma pleurii and peritonei secondary to sigmoid colon adenocarcinoma: a rare clinico-pathologico-radiological presentation

Pseudomyxoma peritonei (PMP) is a rare condition resulting from mucin-producing tumors that have disseminated into intraperitoneal implants and mucinous ascites. The extra-abdominal spread of PMP is exceptionally rare, with few reported cases in the medical literature. Pseudomyxoma pleurii is an infrequently encountered clinical syndrome characterized by transdiaphragmatic pleural extension and spread of PMP. The disease is highly fatal. We hereby report a case of 58 years old woman who presented with an abdominal distension and shortness of breath of 2 months duration. Histopathology confirmed the diagnosis of large mucin-producing rectosigmoid adenomatous polypoid lesion with malignant transformation and PMP that had spread to the right pleural space. PMP from colon tumor is uncommon and its transdiaphragmatic pleural extension is very unusual complicated by management challenge and high mortality rate.