OSTEOMA of the orbit has long been known to ophthalmic surgeons and rhinologists for its effects, as it slowly expands, upon the eye- ball and its nerves, and upon the ethmoidal sinuses. More recently this tumour has become of interest to neurological surgeons, for the experiences of Cushing' have shown that in the course of its expansion it may project through the floor of the anterior fossa and become adherent to and finally penetrate the dura. It may then give rise to such serious complications as cerebro-spinal rhinor- rhoea, intra-cerebral aerocele and meningitis; and in some cases, when the osteoma is small and does not produce much proptosis. one or more of these complications may initiate the illness. This fact has been responsible for the development of an intracranial method of operating on these tumours and the question now arises Fic. 1. Patient before operation, showing forward and lateral displacement of left eyeball.
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Patterson et al. (1931) studied this question.