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SALIVARY mucocoele is a collection of saliva in a cavity lined by granulation tissue (Hedlund and Fossum 2007) that occurs following disruption of a salivary gland or its duct. Neoplasia, sialoliths, trauma and glandular foreign bodies have been reported as causes of mucocoeles in dogs (Trumpatori and others 2007). Mucocoeles most frequently affect the sublingual salivary gland (Spreull and Head 1967, Weber and others 1986, Smith 2005), but mucocoeles affecting the parotid and zygomatic gland have been reported (Schmidt and Betts 1978, Bellenger and Simpson 1992).The zygomatic salivary gland is a globular or pyramidal structure that lies in the rostral orbit lateral to the part of the maxilla that contains the roots of the upper molar teeth. It is surrounded by fat and has a thin, poorly developed capsule (Evans 2003).
Bellenger and Simpson (1992) cited trauma secondary to dental procedures, abscess drainage and tumour removal as causes of four mucocoeles in a case series of 60 dogs, although the type of dental procedure was not recorded. Only one zygomatic salivary mucoceole was diagnosed in this case series, and the affected animal was euthanased due to an underlying aggressive aetiology. Schmidt and Betts (1978) reported two cases of zygomatic salivary mucoceole in dogs and reviewed an additional two cases, all secondary to non-specific trauma. A single case of zygomatic salivary mucocoele has been reported in a cat, although the causal factor was not elucidated (Speakman and others 1997).
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