Dyschromatopsy and visual allesthesia in a glioblastoma multiforme patient

Abstract

AbstractPurpose To report a case of glioblastoma multiforme with dyschromatopsy and visual allesthesia.Methods A 46 – year old male presented in emergency ophthalmologic department with recent color perception disturbance complaints noticed during his occupation (PC technician). The patient underwent a thorough ophthalmological examination and then he was referred to the neurological department for further management.Results Patient presented an atypical pattern of color perception disturbance revealed by color blindness Ishihara test and Fransworth‐Munsell D‐15 test. Patient’s best corrected visual acuity decreased progressively during his hospitalization and he also experienced paroxysmally illusory left homonymous transpositions of subjects viewed in the right homonymous visual field. The transposition occurred from normal to the defective visual field. This condition is called visual allesthesia. The visual field evaluation revealed homonymous left hemianopsia and magnetic resonance imaging revealed glioblastoma multiforme localized in the right occipital lobe with compressive effects on the occipital horn of the right lateral ventricle. The diagnosis was confirmed by biopsy.Conclusion A thorough ophthalmologic and neuro‐imaging control in patients with sudden color perception disturbance is suggested. Visual allesthesia is a rare condition experienced by patients with temporal or occipital cortex damage. Glioblastoma multiforme localized in the right occipital lobe was the underlined causative lesion.