<prompt> All are causes of primary amenorrhea EXCEPTMRKH syndromeSheehans syndromeKallmanns syndromeTurners syndrome  <response>: Sheehans syndrome Post paum pitutary necrosis. Occurs as a result of ischemic pituitary necrosis due to severe postpaum hemorrhage Presents as failure to lactate or to resume menses Secondary amenorrhea Other presentation: genital and axillary hair loss, asthenia and weakness, fine wrinkles around the eyes and lips, signs of premature aging, dry skin, hypopigmentation and other evidence of hypopituitarism. 