The Pituitary and Hypothalamus Neurosecretion The Anterior Pituitary The Posterior Pituitary Acromegaly Hyperprolactinaemia Hypopituitarism Polyuria and Polydipsia Primary Polydipsia Nephrogenic Diabetes Insipidus Cranial Diabetes Insipidus Investigation of Polyuria Treatment of Cranial Diabetes Insipidus The Syndrome of Inappropriate Antidiuresis Imaging in Hypothalamo–Pituitary Disease