<prompt> Which of the following is not a cause of primary amenorrhea?Sheehans syndromeKallmans syndromeTurners syndromeRokitansky syndrome  <response>: Sheehans syndrome is associated with secondary amenorrhea and not primary amenorrhea all the other options are examples of primary amenorrhea, hence sheehans syndrome is the best answer. Sheehans syndrome: Is postpaum pituitary apoplex The hyperplastic enlargement of the pituitary during pregnancy increases the risk for hemorrhage and infarction ischemic necrosis of most of the anterior pituitary This leads to secondary amenorrhea, failure of lactation after delivery Ref: Harrisons Principles of Internal Medicine, 16th Edition, Page 2078; Shaws Textbook of Gynaecology, 14th Edition, Pages 259-60 