Table 2

Choroidal melanoma characteristics, plaque radiotherapy parameters and initial RM treatment

Visual acuity prior to plaque, n (%)
 20/20 to 20/50 (logMAR 0 to 0.4)7 (88)
 20/60 to 20/200 (logMAR 0.5 to 1)1 (12)
Tumour size: mean (median, range)
 Basal dimension11.1 (11.9, 7.1–13.9)
 Thickness4.3 (2.8, 2.3–10.9)
 Proximity to optic disc3.2 (2.5, 0.5–9.4)
 Proximity to fovea1.8 (1.5, 0–5.7)
Isotope: mean (%)
 Palladium-1037 (88)
 Iodine-1251 (12)
Mean radiation dose, Gy: mean (median, range)
 Apex69.4 (70.2, 48.2–87.4)
 Optic disc56.2 (9.0–125.1)
 Fovea81.5 (75.2, 22.7–138.2)
AJCC stage: stage (n)T1(4), T2(2), T3(2)
 Months to onset of RM: mean (median, range)26 (25, 12–44)
  • AJCC, American Joint Committee on Cancer; RM, radiation maculopathy.