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→Pituitary neoplasia in the horse
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>]]
====Pituitary neoplasia in the horse====
====[[Equine Pituitary Pars Intermedia Dysfunction|Pituitary neoplasia in the horse]]====
Neoplasia usually occurs in the ''pars intermedia'' of the anterior pituitary and compresses the hypothalamus.
Neoplasia usually occurs in the ''pars intermedia'' of the anterior pituitary and compresses the hypothalamus.