Sheehan's syndrome

            During pregnancy the pituitary gland enlarges and becomes more susceptible to circulatory disturbances. Sheehan's syndrome or postpartum necrosis results from pituitary hemorrhage and infarction associated with complicated deliveries. Initial imaging studies will reveal a hemorrhagic gland in a normal sized sella. Over time, the gland involutes, resulting in a partially and completely empty sella. 

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