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Primary Hypothyroidism in a Child Mimicking a Pituitary Macroadenoma

We report the case of an 11-year-old girl with primary autoimmune hypothyroidism causing secondary pituitary enlargement. She presented with headaches and a pituitary mass on MRI thought to be due to a pituitary macroadenoma. Resolution of the pituitary mass and symptoms occurred with thyroxine therapy. It is mandatory to rule out primary hypothyroidism as a cause of pituitary enlargement before surgery is considered.