"Case of the Week" for the American Journal of Neuroradiology, with the following description: Sagittal T1WI pre- (A) and postcontrast (B) show a large, lobulated, heterogeneously-enhancing pituitary mass that expands the sella and demonstrates a suprasellar extension. Axial (C) and sagittal (D) T2WI demonstrate diffuse thickening of the calvarium with heterogeneous marrow signal. Axial (E) and coronal (F) noncontrast CT through the level of the parathyroid gland demonstrate hypodense nodules posterior and inferior to the thyroid lobes (arrows).