A macula-involving homonymous hemianopsia is most likely caused by which?

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Prepare for the NBEO Ocular Anatomy Posterior Segment and Cranial Nerves Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

A macula-involving homonymous hemianopsia is most likely caused by which?

Explanation:
Macula-involving homonymous hemianopsia points to a post-chiasmal lesion that disrupts the fibers carrying central vision. The macula has a large cortical representation and, with a vascular supply that can be resilient in sudden strokes, central vision is often spared in typical vascular events. A slowly enlarging compressive tumor, on the other hand, tends to affect the posterior optic radiations or occipital cortex more diffusely and in a way that includes the macular (central) fibers, producing a homonymous hemianopia that involves central vision. This gradual, mass-effect pattern is more consistent with macula-involving defects.

Macula-involving homonymous hemianopsia points to a post-chiasmal lesion that disrupts the fibers carrying central vision. The macula has a large cortical representation and, with a vascular supply that can be resilient in sudden strokes, central vision is often spared in typical vascular events. A slowly enlarging compressive tumor, on the other hand, tends to affect the posterior optic radiations or occipital cortex more diffusely and in a way that includes the macular (central) fibers, producing a homonymous hemianopia that involves central vision. This gradual, mass-effect pattern is more consistent with macula-involving defects.

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