Benign and Suspicious Ovarian Masses—MR Imaging Criteria for Characterization: Pictorial Review

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