Stage IIIB includes: (T3d, N0, M0); (T4b-c, N0, M0). T3d: Ciliary body and choroid: Tumor size category 3 with ciliary body involvement and extraocular extension less than or equal to 5 mm in diameter. T4b: Iris: Tumor with extrascleral extension more than 5 mm in diameter. Ciliary body and choroid: Tumor size category 4 with ciliary body involvement. T4c: Ciliary body and choroid: Tumor size category 4 without ciliary body involvement but with extraocular extension less than or equal to 5 mm in diameter. N0: No regional lymph node metastasis. M0: No distant metastasis. (AJCC 7th ed.) [from NCI]