title: A diplopia dilemma.
abstract: A 38-year-old man experienced double vision with pupillary abnormalities and convergence retraction nystagmus. A mass, which responded to radiation therapy, was seen as the cause of his dorsal midbrain syndrome. The neural control of vertical eye movements is reviewed and the management of a third ventricular-pineal region mass discussed.
authors.affiliation: Department of Ophthalmology, Christchurch Hospital, Christchurch, New Zealand.
authors.forename: Mark
authors.initials: M
authors.lastname: Saunders
authors.forename: Celeste
authors.initials: C
authors.lastname: Guinane
authors.forename: Martin
authors.initials: M
authors.lastname: MacFarlane
authors.forename: Ken
authors.initials: K
authors.lastname: Tarr
authors.forename: M Tariq
authors.initials: MT
authors.lastname: Bhatti
authors.forename: David W
authors.initials: DW
authors.lastname: Pincus
mesh_terms: D000328:Adult; D003937:Diagnosis, Differential; D004172:Diplopia / Q000175:diagnosis / Q000209:etiology* / Q000601:surgery; D004724:Endoscopy; D005500:Follow-Up Studies; D006801:Humans; D006849:Hydrocephalus / Q000150:complications* / Q000175:diagnosis / Q000601:surgery; D008279:Magnetic Resonance Imaging; D008297:Male; D014696:Ventriculostomy / Q000379:methods