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Ectopic posterior pituitary (MRI)

(A)Sagittal T1 precontrast, (B) sagittal T1 postcontrast, (C) coronal T1 precontrast, and (D) coronal T1 postcontrast images demonstrate a nondescended posterior hypophysis situated just posterior to the optic chiasm in an 18 year old with primary amenorrhea. The nonenhancing high signal focus of the posterior pituitary (arrowhead) is readily seen on all images. (Contributed by Dr. Diana Gomez-Hassan.)

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Associated Disorders

  • Craniopharyngioma
  • Diabetes insipidus
  • Diabetes mellitus
  • Direct trauma
  • Disconnected pituitary syndrome
  • Dysgerminoma
  • Empty sella syndrome
  • Hemochromatosis
  • Infiltrative diseases
  • Langerhans cell histiocytosis
  • Lymphocytic hypophysitis
  • Macroadenoma
  • Meningioma
  • Metastatic carcinoma
  • Neurosarcoidosis
  • Neurosyphilis
  • Neurotuberculosis
  • Pituitary apoplexy
  • Pituitary ischemic necrosis
  • Pituitary macroadenoma
  • Pituitary tumors
  • Polyglandular failure syndrome
  • Sheehan syndrome
  • Wegener granulomatosis