Ultrasound B-scan versus anterior segment optical coherence tomography: image comparison for the three most common diagnoses
| Categories | Iris naevus N=62* Number (%) | IPE cyst N=23 Number (%) | Iris melanoma N=11† Number (%) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| USB | AS-OCT | ND | USB | AS-OCT | ND | USB | AS-OCT | ND | |
| Better overall tumour visualisation | 15 (24.2) | 28 (45.2) | 19 (30.6) | 12 (52.2) | 2 (8.7) | 9 (39.1) | 7 (63.6) | 1 (9.1) | 3 (27.3) |
| Better anterior surface resolution | 0 | 37 (59.7) | 25 (40.3) | 1 (4.3) | 7 (30.5) | 15 (65.2) | 0 | 1 (9.1) | 10 (90.9) |
| Better posterior surface resolution | 30 (48.4) | 19 (30.6) | 13 (21) | 15 (65.2) | 5 (21.7) | 3 (13.1) | 9 (81.8) | 1 (9.1) | 1 (9.1) |
| Better lateral surface resolution | 6 (9.7) | 44 (71) | 12 (19.4) | 14 (60.9) | 4 (17.4) | 5 (21.7) | 3 (27.3) | 3 (27.3) | 5 (45.4) |
| Better internal structure resolution | 8 (12.9) | 37 (59.7) | 17 (27.4) | 14 (60.9) | 3 (13) | 6 (26.1) | 6 (54.5) | 2 (18.2) | 3 (27.3) |
| Better resolution if pigmented | 11 (19.6) | 27 (48.2) | 18 (32.1) | NA | NA | NA | 6 (66.7) | 2 (22.2) | 1 (11.1) |
| Better resolution if non-pigmented | 4 (66.6) | 1 (16.7) | 1 (16.7) | NA | NA | NA | 0 | 0 | 2 (100) |
| Less posterior shadowing | 43 (69.4) | 1 (1.6) | 18 (29) | 6 (26.1) | 2 (8.7) | 15 (65.2) | 10 (90.9) | 0 | 1 (9.1) |
| Elevation (mm) Mean (SD) | 0.8 (±0.9) | 0.6 (±0.7) | NA | 1.7 (±1.6) | 0.9 (±1.5) | NA | 2.6 (±1.5) | 0.8 (±10.8) | NA |
| Longitudinal base (mm) Mean (SD) | 1.3 (±1.2) | 2.2 (±1.6) | NA | 2.2 (±1.9) | 1.9 (±1.9) | NA | 3.6 (±1.3) | 3.0 (±2.2) | NA |
| Transverse base (mm) Mean (SD) | 1.4 (±1.3) | 2.1 (±1.5) | NA | 2.3 (±1.9) | 2.0 (±2.2) | NA | 3.7 (±1.4) | 3.3 (±1.6) | NA |
*N=56 pigmented and 6 non-pigmented lesions.
†N=9 pigmented and 2 non-pigmented lesions.
AS-OCT, anterior segment optical coherence tomography; IPE, iris pigment epithelial; NA, not applicable; ND, no difference; USB, ultrasound B-scan.