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→Introduction
==Introduction==
==Introduction==
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.
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>
==Signalment==
==Signalment==