visual pathway: Post chiasmal
interference in visual pathway produces homonymous hemianopia in visual field from a single lesion.
compression typically leads to bitemporal hemianopia, (18) and post-chiasmal compression generally leads to homonymous hemianopia.
Previously limited to opticospinal involvement and seropositivity of anti-Aquaporin 4 (AQP4) or NMO IgG antibody, NMOSD also includes clinical syndromes and MRI findings related to the area postrema, other brainstem, diencephalic, or cerebral presentations in addition to seronegative opticospinal cases with optic chiasmal
involvement and longitudinally extensive spinal cord lesions (LESCLs) .
Forty two patients with optic chiasmal
craniopharyngioma, confirmed by computerized tomography (CT) and/or magnetic resonance imaging (MRI) scan, were included in the study.
Visual field defects can broadly arise from lesions occurring pre-chiasmal, chiasmal
b) The defect suggests a lesion that is chiasmal
Most commonly a nasal defect of the optic disc may be seen, with hypopigmentation of the inferonasal retina, and these individuals may have a supero-temporal visual field defect2 that does not observe the vertical midline, which distinguishes it from a visual field defect that is due to chiasmal
Gross defects such as hemianopias, which can be caused by chiasmal
tumours, can be detected this way.