A patient presents with a left homonymous hemianopia that is denser inferiorly (inferior quadranopia). The lesion is most likely located at:

• A Right temporal lobe (inferior optic radiation — Meyer's loop)
• B Right parietal lobe (superior optic radiation) ✓
• C Right occipital cortex (inferior calcarine fissure)
• D Right lateral geniculate nucleus

Explanation

Superior optic radiation fibers run through the parietal lobe and carry fibers from the inferior visual field (which crosses the optic chiasm and becomes the contralateral superior retinal fibers serving inferior visual field). A parietal lobe lesion on the right produces a left homonymous hemianopia that is denser inferiorly — a 'pie in the basement' deficit. Temporal lobe lesions (Meyer's loop) produce superior quadrantanopia ('pie in the sky'). The occipital cortex representation of the macular region is at the occipital pole.

Reference: Khurana Comprehensive Ophthalmology, 7th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.