F-18 FDG PET-CT findings in a case of normal-sized ovarian cancer syndrome.

The "normal-sized ovary carcinoma syndrome (NOCS)" is defined as a clinical situation, in which diffuse metastatic malignant disease of the abdominal cavity of the female with normal-sized ovaries is noted, but no origin is assigned by preoperative or intraoperative evaluation. We report a case of ovarian serous surface papillary carcinoma with manifestation of NOCS, where F-18 FDG PET/CT scan correctly detected the site of origin, although computed tomography and magnetic resonance imaging failed to detect it. This technique may play a role to discern the site of origin of some malignancies.