J. Kowalesky1; A.H. Oshiro1; A.C. Lagoa2; M.A. Gioso1
An eight years female mongrel dog was presented to the Veterinary Teaching Hospital of the University of São Paulo, "snoring" when eating and sleeping, had medical history of cervical mucocele treated only with medication three years before. The animal was radiographed and it was noticed a soft tissue structure in the pharyngeal area. The dog was sedated for evaluation. There was a floating collection in pharyngeal region that was aspirated; laboratory results from this fluid showed that it was saliva. Surgical procedure (marsupialization) was performed. After 2 months the dogs was sedated again and there was a total remission of the mucocele. The main functions of salivary glands are to lubricate food materials for swallowing and to keep the oral mucosa surfaces bathed with a fluid rich in antibacterial barriers. In carnivore animals, due to the rapid passage of the food through the mouth, there is a need for a large volume of lubricating fluid for a short time and for continuous secretion at a basal level at other times. Major salivary glands in carnivores are the mandibular, parotid, sublingual and zygomatic. There are many others areas of salivary glands tissue scattered throughout the mouth, particularly in the lips and the glossopalatine arch area. Clinical disease associated with salivary glands results from several processes. The conditions that generally affect the salivary glands are: overproduction, immune-mediated disease, compartment syndrome, sialolith, neoplasias and mucoceles. Mucoceles occur due to extravasation of saliva from a duct, forming a collection of saliva and mucous tissue in the subcutaneous space. Saliva takes the path of least resistance; the most common sites for collection of the extravased saliva are the subcutaneous tissues of the intermandibular or cranial cervical area, the sublingual tissues and less common in the pharyngeal wall. The mucoceles are generally seen as protuberances painless and floating. It is unusual a spontaneous regression of the process. A pharyngeal mucocele can obstruct the pharyngeal airway; emergency lancing may be necessary occasionally to relieve respiratory distress. Diagnosis is by aspiration of golden-colored or blood-stained mucus from swelling. Staining a smear of the fluid with a mucus specific stain, such as PAS confirms the diagnosis. Periodic drainage is not recommended for pharyngeal mucoceles.