Fig. 10.

Pituitary hyperplasia associated with primary hypothyroidism. A 10-year-old male with short stature and free T4 levels at 0.52 ng/dL (mildly low) and thyroid-stimulating hormone levels at 794.8 μIU/mL (high). a Sagittal T1WI shows pituitary enlargement. The pituitary body is 13-mm high (arrow), with normal hyperintensity in the posterior pituitary gland (arrowhead). b Coronal T2WI shows symmetric enlargement of the anterior pituitary gland. c The patient was treated using thyroid hormone replacement therapy; 10 years post-treatment, the pituitary gland was normal in size on T1WI