| Grade | Criteria | US echogenicity |
| I | Hairline thin wall, no nodule, no dopplar flow, no calcification, no septations | Anechoic |
| II | Hairline thin wall, no nodule, no dopplar flow, no clacification, few thin septations < 1 mm. | Echogenic (Debris or hemorrhage ) |
| III | Thick wall > 1 mm, multiple septations > 1 mm, no nodule, calcification and Doppler flow present. | Varies |
| IV | Soft tissue nodule | Soft tissue |