Glioma of the Optic Nerve.

Examination.-The left eye was markedly proptosed (Fig. 1, opposite) and displaced downwards and inwards. The ocular movements were restricted in all directions and elevation was completely absent. The lid movements were normal and the patient could close the eyevoluntarily. The conjunctival vessels were engorged. The pupil was dilated and fixed, with no perception of light. The left optic disc was completely white, its surface was flat and the physiological cup was obliterated. The surrounding retina was pale and oedematous but no haemorrhages or exudates could be seen. Blood vessels were markedly tortuous and there was an abnormal loop of a vessel on the temporal half of the disc. A mass was palpable in the upper temporal quadrant of the left orbit, and a skiagram showed amarked enlargement of the left optic foramen. A lateral view of the skull showed no abnormality of the anterior clinoid process or the sella turcica.