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Pressure on neighbouring structures causes clinical signs, for example:
Pressure on neighbouring structures causes clinical signs, for example:
*Pressure on the optic chiasma produces ocular signs.
*Pressure on the optic chiasma produces ocular signs.
*Pressure on the hypothalamus may lead to [[Frohlich's Adiposogenital Syndrome - Pathology|Frohlich's adiposogenital syndrome]].
*Pressure on the hypothalamus may lead to [[Frohlich's Adiposogenital Syndrome|Frohlich's adiposogenital syndrome]].
*Pressure on the neurohyposphysis may lead to failure of ADH secretion. This will allow large volumes of water to be lost form the kidney; [[Diabetes Insipidus]].
*Pressure on the neurohyposphysis may lead to failure of ADH secretion. This will allow large volumes of water to be lost form the kidney; [[Diabetes Insipidus]].
[[Image:Pituitary tumour.jpg|right|thumb|125px|<small><center>'''Pituitary neoplasia'''. Courtesy of A. Jefferies</center></small>]]
[[Image:Pituitary tumour.jpg|right|thumb|125px|<small><center>'''Pituitary neoplasia'''. Courtesy of A. Jefferies</center></small>]]