Peritoneal malignant mesothelioma, according to histology can be divided into fibrous mesothelioma, epithelioid mesothelioma, mixed mesothelioma. 1. Fibrous mesothelioma: mostly seen in limited mesothelioma, the cells are mostly composed of spindle cells, which may be accompanied by unequal collagen fibers. 2. Epithelioid mesothelioma: mostly occurs in diffuse mesothelioma, the tumor cells in this type are cubic or polygonal, often with vascular or papillary structure, and the tumor cells are of different sizes, wrapped by connective tissue. 3. Mixed mesothelioma: also called two-way differentiated mesothelioma, the tumor tissue in this type is composed of epithelioid cells and sarcoma-like components, and its shape is similar to synovial sarcoma. Patients with peritoneal malignant mesothelioma are advised to go to the hospital in time for consultation and standardized treatment according to the doctor’s instruction after the cause of the disease is clarified.