CT and MRI of adnexal masses

Ultrasound is the primary modality for the evaluation of an adnexal mass, and MRI is offen used to further characterize indeterminate lesions, since it provides information about soft tissue masses. Although computed tomography (CT) is not used for the primary evaluation of an adnexal mass, it is often used in the work-up of women with abdominal or pelvic pain. This article addresses imaging features of an adnexal mass that are suggestive of malignancy, describes the appearance of common benign adnexal masses on MRI and CT, and details the indications for MRI of a suspected adnexal mass.