Normal pituitary stalk: high-resolution MR imaging at 3T.

Area of Science:

• Radiology
• Neuroimaging
• Endocrinology

Background:

• Accurate assessment of the pituitary stalk is crucial for diagnosing infundibular lesions.
• Higher field strength MRI, such as 3T, may offer improved visualization of the pituitary stalk compared to 1.5T.

Purpose of the Study:

• To evaluate the normal pituitary stalk using high-resolution magnetic resonance imaging (MRI) at 3 Tesla (3T).
• To establish standard measurements for the normal pituitary stalk at 3T.

Main Methods:

• 29 healthy volunteers underwent sagittal MPRAGE and high-resolution oblique-axial T2-weighted MRI at 3T.
• Measurements included pituitary stalk diameter and length, and infundibular recess depth.
• Signal intensity of the pituitary stalk was assessed visually on T2-weighted images.

Main Results:

• Normal pituitary stalk diameters were measured at the pituitary insertion and optic chiasm levels.
• The average length of the pituitary stalk was 5.91 mm, and the infundibular recess depth was 4.69 mm.
• T2-weighted images revealed central hyperintensity with a peripheral rim in 69% of subjects and homogeneous isointensity in 31%.

Conclusions:

• The study provides standard reference measurements for the normal pituitary stalk at 3T MRI.
• Observed signal intensity patterns may correspond to the infundibular stem and pars tuberalis.