Which of the following can cause superior temporal quadrantopia (AIPG 2010)
|A||Temporal lobe tumor|
|B||Frontal lobe tumor|
1. Temporal lobe tumours - causes superior quadrantic hemianopia (pie in the sky) because inferior fibres of the optic radiation pass through temporal lobe
2. Parietal lobe tumours - causes inferior quadrantic hemianopia (pie on the floor) containing superior fibres of the optic radiation pass through temporal lobe
3. Sagittal (central) lesions of the chiasma - These are characterized by bitemporal hemianopia and bitemporal hemianopic paralysis of pupillary reflexes. These usually lead to partial descending optic atrophy.
4. Common causes of central chiasmal lesions are suprasellar aneurysms, tumours of pituitary gland, craniopharyngioma, suprasellar meningioma, and glioma of the third ventricle, third ventricular dilation due to obstructive hydrocephalus