Serous tumour

A serous tumour is a neoplasm that typically has papillary to solid formations of tumor cells with crowded nuclei. They typically arise on the modified Müllerian-derived serous membranes that surround the ovaries in females. Such ovarian tumors are part of the surface epithelial-stromal tumour group of ovarian tumors. They are common neoplasms with a strong tendency to occur bilaterally, and they account for approximately a quarter of all ovarian tumors.

Rarely, serous tumors arise from other parts of the peritoneum, including serous primary peritoneal carcinomas. Even more rarely they arise in other body locations, such as the lungs. Despite the name, uterine serous carcinoma arises from the endometrium and not the serous membrane.