Pararenal multicystic mesothelioma. A case report

Multicystic mesothelioma is a rare benign proliferation arising from the mesothelial lining of the peritoneal cavity. Fewer than a hundred cases are described in the literature. The tumor mainly occurs attached to pelvic and upper abdominal organs, sometimes in a retroperitoneal site. Most of the patients are females. We report an extremely rare finding of a retroperitoneal multicystic mesothelioma closely related to the left kidney in a male, which led to the diagnosis of a cystic carcinoma and was consequently treated with nephrectomy. Pathology, diagnosis, treatment and prognosis are discussed on the basis of our case.