[The extension of retinoblastoma into neighboring structures].

Fourteen cases with retinoblastoma has been histologic studied. In eleven cases of them has been observed the invasion in the neighbour structures following the tumoral mass development: four cases in the vitreous, one case in the vitreous and the choroid, sclera and the optic nerve, one case in the vitreous choroid and optic nerve, two cases in the optic nerve. The tumoral invasion in the neighbour structures was observed only at the undifferentiated retinoblastoma.