Question: How often are pituitary tumors not seen on an MRI?

Answer: Most pituitary tumors causing Cushing’s are small (< 1 cm) and are seen on pituitary MRI in about 60% of adults and 55% of children with Cushing’s disease when performed using SE T1 techniques on a 1.5 Tesla scanner, with a contrast agent.

By Dr. Lynnette Nieman, NIH, Bethesda, MD, Spring, 2016