Compression of which structure by a mass commonly causes bitemporal visual field loss (bitemporal hemianopia)?

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Multiple Choice

Compression of which structure by a mass commonly causes bitemporal visual field loss (bitemporal hemianopia)?

Bitemporal hemianopia occurs when the optic chiasm, where the nasal (crossing) fibers from both eyes meet, is compressed. A mass in the pituitary region, such as a pituitary adenoma, sits directly beneath and can enlarge to press on the central part of the chiasm, cutting the crossing nasal fibers from both eyes and causing loss of the outer (temporal) visual fields in both eyes. Optic nerve lesions produce monocular loss in one eye, not a binocular bitemporal pattern. Pontine lesions result in different syndromes affecting gaze or the contralateral body, not a symmetric temporal field loss. Periventricular leukomalacia is an infantile white-matter injury with motor and cognitive consequences, not a classic cause of this specific field defect.

Bitemporal hemianopia occurs when the optic chiasm, where the nasal (crossing) fibers from both eyes meet, is compressed. A mass in the pituitary region, such as a pituitary adenoma, sits directly beneath and can enlarge to press on the central part of the chiasm, cutting the crossing nasal fibers from both eyes and causing loss of the outer (temporal) visual fields in both eyes.

Optic nerve lesions produce monocular loss in one eye, not a binocular bitemporal pattern. Pontine lesions result in different syndromes affecting gaze or the contralateral body, not a symmetric temporal field loss. Periventricular leukomalacia is an infantile white-matter injury with motor and cognitive consequences, not a classic cause of this specific field defect.

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