Fig. 6. Contrast-enhanced computed tomography (CT) scan of 49-year-old woman with complaint of acute pelvic pain as false-negative case.

Transverse CT scan (A) and coronal reformation (B) show well-defined cystic mass (^*) in pelvic cavity. Both readers provided scores of 2 as level of suspicion for adnexal torsion using 5-point scale. Adnexal mass was serous cystadenoma with torsion in right ovary.