Table 2 The ABC classification

Group A: small tumors away from foveola and disc

   • Tumors <3 mm in greatest dimension confined to the retina and

   • Located at least 3 mm from the foveola and 1.5 mm from the optic disc

Group B: all remaining tumors confined to the retina

   • All other tumors confined to the retina and not in group A

   • Subretinal fluid (without subretinal seeding) < 3 mm from the base of the tumor

Group C: local subretinal fluid or vitreous seeding

   • Subretinal fluid alone >3 mm and < 6 mm from the tumor

   • Vitreous or subretinal seeding < 3 mm from the tumor

Group D: diffuse subretinal fluid or seeding

   • Subretinal fluid > 6 mm from the tumor

   • Vitreous or subretinal seeding > 3 mm from the tumor

Group E: presence of any one or more of these poor prognosis features

   • More than 2/3 of the globe filled with tumor

   • Tumor in the anterior segment or anterior to the vitreous

   • Tumor in or on the ciliary body

   • Iris neovascularisation

   • Neovascular glaucoma

   • Opaque media from hemorrhage

   • Tumor necrosis with aseptic orbital celullitis

   • Phthisis bulbi