PCA Infarct – Macular Sparing — SCE Neurology MCQ
Instant feedback + full explanation. One question, done properly.
Educational content. Not a substitute for clinical judgement or local policy.
Reveal the answer and explanation
Correct answer: B — Occipital pole has dual blood supply from PCA and MCA
Macular sparing in PCA strokes is explained by the dual blood supply of the occipital pole (macular representation) from both PCA and MCA branches. PCA occlusion spares the pole. A: Macula is in occipital cortex. C: LGN processes all visual input but cortical dual supply explains sparing. D: Calcarine sulcus does process macular vision. E: Bilateral representation exists but dual blood supply is the primary explanation.
Reference: Clinical Neuroanatomy