Enlargement of the Proximal Pituitary Stalk Associated with Spontaneous Recovery from Multiple Pituitary Hormone Deficiencies

Sagittal unenhanced (A) and contrast-enhanced (B) T1-weighted (TR, 600 ms; TE, 15 ms) MR images in our patient at age 5 years show a slightly thickened proximal stalk (thick arrow) and a threadlike distal stalk. Ectopic posterior pituitary hyperintense signal intensity (thin arrow) is located at the median eminence. The adenohypophysis and sella turcica are small. The apparent lack of enhancement of the proximal stalk (B) is from a delay in imaging after the contrast injection. Coronal images (not shown), which were obtained before the sagittal images, demonstrated enhancement.