Table 1.

Non-contrast MRI score

Non-contrast MRI score	Definition	MRI features
Score 1	No mass	No adnexal mass is demonstrated in pelvic MRI study
Score 2	Benign/likely benign	Radiologically characterized, has to have a radiological diagnosis (e.g. endometrioma, dermoid, fibroma)
Score 3	Indeterminate	Not classified in other scores. It may have a solid appearing component however this does not reach criteria for solid tissue*
Score 4	Suspicious for malignancy	Solid tissue criteria reached
Score 5	Highly suspicious for malignancy	Solid tissue criteria reached and presence of: • Peritoneal implants and/or • Lymphadenopathy and/or • Ascites in the presence of solid tissue, after benign diagnoses are excluded

MRI magnetic resonance imaging

*Solid tissue is defined as tissue with intermediate signal intensity on T2-weighted imaging, low signal intensity on T1-weighted imaging and corresponding true diffusion restriction