ATYPICAL OPHTHALMIC MANIFESTATIONS OF CHIASMAL TUMOURS

Abstract

Bitemporal hemianopic visual field loss, headache,
endocrinopathy and other signs of raised intracranial tension
are the most common presenting features of chiasmal
tumours. We report two patients with chiasmal tumours
presenting with atypical clinical features. One patient
presented with bilateral optic disc cup ratio of 0.6 simulating
normotensive glaucoma was later diagnosed with
craniopharyngioma. Another patient presented with features
of retrobulbar neuritis with sudden onset unilateral defective
vision was subsequently diagnosed as pituitary adenoma.
With a strong clinical suspicion and help of appropriate neuro
imaging one can accomplish early detection of
chiasmallesions among patients with atypical ophthalmic
manifestations unexplained by obvious pathological
conditions within the eye may prevent disastrous blindness
and other neurological complications.
Keyword :chiasmal tumours, Normotensive glaucoma,
retrobulbar neuritis