Adnexal Masses - Benign vs Malignant Features on Ultrasound and MRI
Benign Features: 
B1- Unilocular 
B2- Presence of solid components with a largest diameter of <7 mm 
B3- Presence of acoustic shadows 
B4- Smooth multilocular tumor with a largest diameter of <100 mm
B5- No blood flow (color score 1) 
Malignant Features:
M1- Irregular solid tumor
M2- Presence of ascites
M3- At least 4 papillary structures
M4- Irregular multilocular-solid tumor with a largest diameter of ≥100 mm
M5- Very strong blood flow (color score 4)

doi:10.3390/cancers12123795

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