Can also spread to the choroid plexus where it can metastasize hematogenously. Once tumor fills the orbit it also can spread directly through the skull and brain. Metastasizes to brain, bone, liver, kidney, lung, testes, and lymph nodes. If treated with radiation patient is at risk for osteosarcoma 10 years later. On CT is a well defined orbital calcified mass that does not enhance.
Metastatic lesion are less frequently calcified and often enhance.
Orbital extension can be seen as thickening of the optic nerve. See References Chapter. All rights reserved.