Pregnancy related pituitary enlargement mimicking macroadenoma.

A 38-year-old woman presented at 30 weeks gestation with bi-temporal upper quadrantanopia. MRI showed appearances typical of a pituitary macroadenoma. It was agreed that pituitary decompresssion would only be indicated if the visual field defect worsened. MRI imaging 2 weeks postdelivery showed complete resolution of the pituitary lesion.