A dry, droopy and dilated eye: a neuro-ophthalmic case with correlation of signs and anatomical tumour spread.

Adenoid cystic carcinoma (ACC) has a propensity for perineural tumour spread. This report concerns a 51-year-old woman who presented with a unilateral red eye with reduced vision, ptosis and a non-reactive pupil. This patient had a maxillary sinus ACC with perineural spread, leading to the neuro-ophthalmic signs. She is currently being treated with radiotherapy.