Which of the following is NOT true regarding a Macular Sparing Homonymous Hemianopsia?

Prepare for the NBEO Systemic Disease Exam. Use flashcards and multiple-choice questions to test your knowledge. Each question includes hints and explanations. Enhance your understanding and readiness for the exam.

Macular sparing homonymous hemianopsia is a specific type of visual field loss that typically occurs due to damage in the visual pathways, specifically in the occipital lobe of the brain. In this condition, the peripheral vision is lost on one side while central vision, or the macular area, remains intact.

One reason D is the correct answer is that macular sparing often occurs due to involvement of the occipital lobe infarction, which is frequently linked to ischemia from the posterior cerebral artery. When the visual cortex is affected, it may spare the central vision due to the dual blood supply to the fovea (central part of the retina) from branches of the middle cerebral artery and the posterior cerebral artery. Therefore, while it's possible for both arteries to play a role in cases of homonymous hemianopsia, the macular sparing phenomenon itself does not typically involve simultaneous significant damage from both arterial territories in a straightforward manner.

In contrast, when discussing the other choices, it's essential to understand their implications. An occipital lobe stroke (the first option) is indeed a common cause of this condition. The second and third options reference the middle and posterior cerebral arteries, which are involved

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