<prompt> Most common tumour of pituitary is -ProlactinomaGH secreting adenomaACTH secreting adenomaTSH secreting adenoma  <response>: Ans. is a i.e., Prolactinoma Types of adenomasSecretionStainingPathology of hormone production casesLacto trophicadenomasprolactinomasSecrete prolactinAcidophilicGalactorrhea, hypogonadism, amenorrhea, infertility, and impotence30SomatotrophicadenomasSecrete growth hormone GHAcidophilicAcromegaly in adults; gigantism in children15CorticotrophicadenomasSecrete adenocorticotropic hormone ACTHBasophilicCushings disease10GonadotrophicadenomasSecrete luteinizing hormone LH, follicle stimulating hormone FSH and their subunitsBasophilicUsually doesnt cause symptoms10Thyrotrophic adenomas rareSecrete thyroid-stimulating hormone TSHBasophilic to chromophobicOccasionally hyperthyroidism, usually doesnt cause symptomsLess than 1Null cell adenomasDo not secrete hormonesMay stain positive for synaptophvsin 25 of pituitary adenomas are nonsecretive 