<prompt> Bitemporal hemianopia caused byPituitary adenomaBasal meningiomaCorpus callosal tumorNasopharyngeal carcinoma  <response>: A Pituitary adenoma Bitemporal hemianopia occurs due to pressure or lesion of optic chiasma, so that the nerve fibres going to nasal half of each retina are destroyed. The various causes are pituitary body tumor, craniopharyngioma, suprasellar aneurysm, gliomas of third ventricle, ectopic pine alomas, dermoid tumours etc. 