Pituitary adenomas commonly cause which pattern of visual field defects?

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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

Pituitary adenomas commonly cause which pattern of visual field defects?

Explanation:
Pituitary adenomas compress the optic chiasm where the nasal retinal fibers cross, so the fibers subserving the temporal visual fields are affected in both eyes. This results in a pattern called bitemporal hemianopia, the classic visual field defect seen with pituitary tumors. If the lesion were after the chiasm, you’d expect a homonymous hemianopia on one side; central scotomas point to macular or optic nerve involvement; and bilateral altitudinal defects come from ischemic or optic nerve diseases affecting upper or lower fields. So the bilateral loss of the outer visual fields fits pituitary-driven chiasmal compression.

Pituitary adenomas compress the optic chiasm where the nasal retinal fibers cross, so the fibers subserving the temporal visual fields are affected in both eyes. This results in a pattern called bitemporal hemianopia, the classic visual field defect seen with pituitary tumors. If the lesion were after the chiasm, you’d expect a homonymous hemianopia on one side; central scotomas point to macular or optic nerve involvement; and bilateral altitudinal defects come from ischemic or optic nerve diseases affecting upper or lower fields. So the bilateral loss of the outer visual fields fits pituitary-driven chiasmal compression.

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