Dr. Huang believes that his patient Francine has a tumor on her pituitary gland, which is a structure in the brain. What is the best diagnostic procedure for Francine?

Magnetic resonance imaging (MRI) creates detailed images of structures inside the brain, so it is the best procedure for checking for a tumor on Francine’s pituitary gland. Electroencephalography records electrical activity in the brain, while polysomnography studies sleep; neither is designed to image a tumor. Amniocentesis examines fluid surrounding a fetus.

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