<prompt> A 41-year-old woman undergoes exploratory laparotomy for a persistent adnexal mass. Frozen section diagnosis is serous carcinoma. Assuming that the other ovary is grossly normal, what is the likelihood that the contralateral ovary is involved in this malignancy?5153350  <response>: Serous carcinoma is the most common epithelial tumor of the ovary. On histologic examination, psammoma bodies can be seen in approximately 30 of these tumors. Bilateral involvement characterizes about one-third of all serous carcinomas. Although mesonephroid carcinomas tend to be associated with pelvic endometriosis, a similar association has not been demonstrated for serous carcinomas. 