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MBBS QUESTION #10209
Question 1
A patient with a pituitary macroadenoma develops progressive visual field loss. Compression of the optic chiasm by a pituitary tumor classically produces which visual field defect?
  • Bitemporal hemianopia✔️
  • Homonymous hemianopia
  • Monocular blindness only
  • A central scotoma only
Correct Answer Explanation
The optic chiasm lies directly above the pituitary gland (within the sella turcica); an expanding pituitary adenoma compresses the crossing (nasal) fibers of the chiasm, which carry information from the temporal visual fields of each eye, producing bitemporal hemianopia.