Ectopic Posterior Pituitary in Macroadenomas: Demonstration by Dynamic MR Imaging

Introduction The ectopic posterior pituitary is an aberrant accumulation of neurosecretory materials at the median eminence or infundibular stem resulting in functional preservation of hormonal production and release, which is often seen in patients with transection of the pituitary stalk (1). W can also be developed due to compression to the hypothalamohypophsial tract by alarge macroadenoma (2). However, to our knowledge, the frequency and location of the ectopic posterior pituitary in patients with macroadenomas have not been established.