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Hyperparathyroidism is an [[Endocrine System - Anatomy & Physiology|endocrine]] disease caused by overactivity of the [[Parathyroid Glands - Anatomy & Physiology|parathyroid gland]] and consequent raised body levels of [[Calcium#Parathyroid Hormone|parathyroid hormone (PTH)]]. It occurs in many veterinary species and can be primary or secondary.  
 
Hyperparathyroidism is an [[Endocrine System - Anatomy & Physiology|endocrine]] disease caused by overactivity of the [[Parathyroid Glands - Anatomy & Physiology|parathyroid gland]] and consequent raised body levels of [[Calcium#Parathyroid Hormone|parathyroid hormone (PTH)]]. It occurs in many veterinary species and can be primary or secondary.  
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Primary hyperparathyroidism originates within the parathyroid gland itself and can be due to glandular hyperplasia or [[Neoplasia - Pathlology|neoplasia]]. It is most commonly due to a solitary benign [[Adenoma|adenoma]] of either the [[Parathyroid Glands - Anatomy & Physiology|internal or external parathyroid gland]].<ref name="Merck1">Merck Veterinary Manual, '''Primary Hyperparathyroidism''', accessed online 25/07/2011 at http://www.merckvetmanual.com/mvm/index.jsp?cfile=htm/bc/40407.htm</ref>
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Primary hyperparathyroidism originates within the parathyroid gland itself and can be due to glandular hyperplasia or [[Neoplasia - Pathology|neoplasia]]. It is most commonly due to a solitary benign [[Adenoma|adenoma]] of either the [[Parathyroid Glands - Anatomy & Physiology|internal or external parathyroid gland]].<ref name="Merck1">Merck Veterinary Manual, '''Primary Hyperparathyroidism''', accessed online 25/07/2011 at http://www.merckvetmanual.com/mvm/index.jsp?cfile=htm/bc/40407.htm</ref>
    
==Signalment==
 
==Signalment==
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