What is the imaging technique of choice when a prolactin secreting tumor is suspected? Why?
Magnetic resonance imaging (MRI) of the pituitary with a contrast agent, such as gadolinium, is the imaging technique of choice for the evaluation of pituitary tumors. In particular, discrimination of small tumors is improved. Computed tomography allows better visualization of bone structures, such as the floor of the sella, in cases of large tumors. However, the relationship of the tumor to other soft tissue structures, such as the cavernous sinuses and carotid arteries, is best visualized with MRI. Skull radiography and tomography are not helpful.