Pituitary stalk duplication with intrasellar dermoid and herniation of the third ventricle.

摘要

An 11-year-old boy with short stature (height 111 cm) had a weight of 19 kg and a bone age of 5 years. There were low levels of all the anterior pituitary hormones, but no evidence of central diabetes insipidus. Coronal MR images (Fig. 1) showed duplication of the pituitary infundibulum (arrowheads) and hypothalamus (arrows). A well-defined T1-hyperintense lesion consistent with a dermoid (star) was seen within the sella between the duplicated stalks. Sagittal images (Fig. 2) showed intrasellar and trans-sellar herniation of the third ventricle (star). The anterior pituitary was single; the posterior pituitary was normal.