Peritoneal Epithelioid Mesothelioma

**Semantic type:** Neoplastic Process

**Definition:** Malignant mesothelioma that arises from the peritoneum. It is characterized by the presence of cells with epithelioid morphology. The epithelioid cells usually have eosinophilic cytoplasm, bland nuclei, and form tubulopapillary, microglandular, or sheet-like patterns.