| Criteria |
Type 1 | Thick outer wall (at least 0.5 mm) Thick internal septa (at least 0.5 mm) |
Type 2 | One or more intracystic masses Masses are peripheral, nodular |
Type 3 | Mixed cystic and solid components Predominantly (at least 50%) cystic |
Type 4 | Mixed cystic and solid components Predominantly (at least 50%) solid May include eccentric cystic components |