<prompt> An 18-year-old woman develops weakness, weight gain, amenorrhea, abdominal striae, and behavioral abnormalities. Physical examination reveals lateral visual field loss. Which of the following is the most likely diagnosis?a functional pituitary tumoradrenal hyperplasiaanorexia nervosa with bulimiaglioblastoma multiforme  <response>: The patient has Cushings syndrome secondary to an adrenocorticotropic hormone ACTH-secreting pituitary tumor. Relatively few of such patients have a large pituitary tumor that affects the visual pathways. Over 50 have a microadenoma, which is under 5 mm in diameter. 