Case 112: pituitary stalk transection syndrome with ectopic posterior pituitary gland.

摘要

Midsagittal Tl-weighted MR imaging revealed a small anterior pituitary gland and an absent pituitary stalk. The ectopic posterior pituitary gland appeared as an area of high signal intensity in the midline at the median eminence (Fig 1). Coronal unenhanced and contrast material- enhanced Tl-weighted MR imaging also depicted the ectopic posterior pituitary gland; however, the pituitary stalk was still not visible, even after administration of gadopentetate dimeglumine (Magnevist; Schering, Berlin, Germany) (Figs 2, 3). Discussion Growth hormone deficiency is a common endocrinologic cause of short stature. This hormone deficiency may be idiopathic or associated with organic causes, such as tumors or surgery (1). Idiopathic growth hormone deficiency occurs sporadically and may be isolated or associated with multiple pituitary hormone deficiencies. Findings associated with hypopituitarism include breech presentation, neonatal or early onset hypoglycemia, pro- longed or severe neonatal jaundice, micropenis, and a single central incisor.