Sea saw nystagmus is seen in :: (A) Anterior longitudinal fasiculus, (B) Craniopharyngioma, (C) Medullary lesion, (D) G.B. Syndrome
Answer is B. Ans. is 'b' Craniopharyngioma (Ref Parson, 18/e, p 336).In Parson it is given that sea-saw nystagmus occurs due to para chiasmatic masses and the only para chiasmatic mass in the option is craniopharyngioma.