Visual field defect in a woman with pituitary adenoma compressing the optic chiasma: (A) Homonymous hemianopia, (B) Bitemporal hemianopia, (C) Bi nasal hemianopia, (D) Quadrantanopia
Answer is B. Ref: Kanski: Clinical Ophthalmology; 7th edition.Explanation:Normal chiasmal position is seen in 80%Prefixed chiasma - placed in front of the pituatory fossa - 10%Postfixed chiasma - placed posteriorly above the pituatory fossa-10%.