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Table 2 The ABC classification

From: Retinoblastoma

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