Orbital teratoma: late presentation with normal vision.

Orbital teratoma is a rare, rapidly growing tumour that usually presents with congenital proptosis. Visual outcome is usually poor. A case is described of orbital teratoma presenting in an 18-month-old child as an inferior orbital mass with normal vision and intermittent hypertropia. Computed tomography demonstrated a cystic mass containing a tooth adjacent to the inferior orbital fissure. Histology revealed tissues derived from all three germ cell layers. The tumour was removed with preservation of vision and resolution of the strabismus. Late presentation of an orbital teratoma with a good visual outcome is exceptional.