Studies has shown PET/CT to be particularly useful in distinguishing patients with stages I-IIIB and IIIC-IV, with an accuracy of 98% compared to 88% with CT alone. The latter group is important to identify because optimal debulking often is not possible and they will benefit from preoperative chemotherapy. Currently the use of PET/CT in staging ovarian cancer is controversial, mainly because of the relatively low specificity, due to FDG-uptake in inflammatory cells and benign lesions. The concordance of PET/CT and surgical staging of ovarian cancer have been reported to range from 69% to 78%.8,9, And a recent study found good correlation between PET/CT findings and laparoscopy but a high rate of false negative results in lesions < 5 mm. But dual time point imaging is maybe the solution to this problem. Today it is standard to perform PET/CT scan 60-90 minutes after injection of tracer. Theoretically, you should get increased tumor/background ratio by performing a late scan, thus better being able to distinguish between malignant and benign. Dual time imaging studies in head and neck cancers, breast cancer and lung cancer suggests improvement in diagnostic accuracy of PET. But the use of delayed imaging in ovarian cancer has not been studied.