Retinoblastoma pT4 TNM Finding v8

**Semantic type:** Finding

**Definition:** Evidence of extraocular tumor: tumor at the transected end of the optic nerve, tumor in the meningeal spaces around the optic nerve, full-thickness invasion of the sclera with invasion of the episclera, adjacent adipose tissue, extraocular muscle, bone, conjunctiva, or eyelids. (from AJCC 8th Ed.)