Spontaneous regression of unilateral retinoblastoma in a father of three sons with bilateral retinoblastoma.

Three brothers had bilateral retinoblastoma: one other sibling, a girl, had normal eyes. The parents were second cousins once removed. The father's right divergent eye, 'amblyopic' from childhood, showed a large atrophic patch in the macular area, probably a spontaneously resolved retinoblastoma.