Table 1: MRI Criteria for benign and suspicious adnexal lesions.

Benign Malignant Principal criteria Size <4 cm >4 cm Solid components No Solid part of the mass with heterogeneous enhancement pattern Cystic mass Simple With vegetation and internal structures Thickness of wall or septa <3 mm >3 mm Lobulated mass No Yes Calcifications Wall of cyst, dense Tiny amorphic Necrosis No Yes Papillary projections No Yes, with heterogeneous enhancement pattern Tumor vessels No Yes, with heterogeneous enhancement pattern Additional criteria Lymph nodes Normal (short axis <1 cm) Enlarged (short axis >1 cm) Peritoneal implants No Yes