<prompt> Most common pituitary adenomas are -Growth hormone secreting adenomasACTH secreting adenomasTSH secreting adenomasProlactinomas  <response>: Ans. is d i.e., Prolactinomas o Pituitary adenomas constitute approximate 10 of all primary intracranial neoplasms and about 13 to 12 of all suprasellarjuxtasellar masseso Pituitary adenomas are classified on the basis of hormones produced by the neoplastic cells detected by immunohistochemical stains.o Most common pituitary adenomas are prolactinomas.o Pituitary adenomas can be differentiated from hyperplasia by reticulin stain Absence of reticulin network is seen in adenomao Pituitary adenomas are sellar lesions but larger adenomas can extend through the diaphragm sella into the suprasellar region and compress the optic chiasm causing visual field abnormalities and other cranial nerves. Large adenomas can also erode the sellarturcica and extend into surrounding region ka invasive adenomas 