Figure 1 (A,B) Case 1. Thyrotropin (TSH)‐secreting pituitary microadenoma. (A) Coronal T1‐weighted magnetic resonance image after the administration of gadolinium, obtained in 1995, showing an area of low signal intensity on the right side of the pituitary gland. The patient underwent a total thyroidectomy in 1997. (B) The coronal T1‐weighted post‐gadolinium image on the right was obtained in 2003 and shows a 7×8‐mm intrasellar enhancing mass on the right side of the pituitary gland. (C,D) Case 2. TSH‐secreting pituitary adenoma. Trans‐sphenoidal surgery in 1991 and radioiodine treatment in 1993. (C) Coronal T1‐weighted MRI scan obtained in 1997, showing some residual adenomatous material in the pituitary fossa on the right side that enhances after gadolinium administration. (D) The coronal T1‐weighted image on the right was obtained in 2003 and shows a 6×5‐mm mass in the right side of the pituitary fossa that enhanced with gadolinium administration (POST GAD).