The characteristic field defect seen in pituitary tumors is: (A) Homonymous hemianopia, (B) Complete vision loss, (C) Binasal hemianopia, (D) Bitemporal hemianopia
Answer is D. Ans. (d) Bitemporal hemianopiaRef: Harrison's 19th ed. /198-199"Bitemporal hemianopia is usually caused by tumors in the region of the sells turcica, pressure by a suprasellar aneurysm or by chronic arachnoiditis; these press upon the chiasma so that the fibers going to thenasal halves of each retina are destroyed. Tumors of the pituitary body are most common.