Primary neuroepithelial cyst | Highly reflective, smooth cyst wall <0.2 mm thick | ND | 1.7 (0.8–3.5) |
Anechoic centre |
May be bilateral (42%) or multiloculated (26%) |
No solid component* |
Iris location: peripheral (n = 22), mid-zone (n = 6) and central (n = 2). Usually inferotemporal iris |
Iris naevus | Solid plaque-like lesion on the anterior iris surface and/or stroma | 1.8 (0.9–3.2) | 2.3 (1.2–5.0) |
Heterogeneous internal reflectivity |
Posterior iris surface flat or smoothly concave. |
Minor degrees of pupil distortion (19%). |
Minimal or no growth tendency on serial biometry |
Iris melanoma | Solid irregular iris mass | 2.1 (1.3–4.8) | 4.2 (1.3–9.0) |
Variable internal reflectivity |
Distortion of surrounding structures (81%) |
Irregularity or convex bowing of posterior iris plane |
Enlargement on serial biometry |
Ciliary body melanoma | Oval shaped mass centred on the ciliary body | 6.3 (1.7–10.3)† | 8.9 (1.7–17.9)† |
Usually solid, cavitation may occur (9.5%) |
Low to medium internal reflectivity |
Invasion of adjacent tissues may be evident |
Anterior choroidal melanoma | Ciliary body /iris extension can currently be appreciated by UBM | ND | ND |
Invasion usually appears as tissue of reduced reflectivity compared to the surrounding ciliary body /iris. |