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IOTA Simple rules.
| Benignity Characteristics (B Features) |
|---|
| B1: Unilocular B2: Presence of solid component < 7 mm maximum diameter B3: Acoustic shadows B4: Regular multilocular tumor with largest diameter < 100 mm B5: No blood flow (score color 1) |
| Malignancy characteristics (M features) |
| M1: Irregular solid tumor M2: Ascites M3: At least 4 papillary structures M4: Multilocular irregular solid tumor with maximum diameter ≥ 100 mm M5: Very strong blood flow (score color 4) |
