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Chronic sialadenitis is characterized by repeated episodes of pain and inflammation caused by decreased salivary flow and salivary stasis. It most often affects the parotid gland. Sialectasis resembles chronic recurrent sialadenitis and associated with granulomatous or autoimmune disease. Mumps or viral parotitis is a viral infection caused by paramyxovirus, contracted by droplet infection and fomites.
Dry mouth due to any cause is a predisposing factor of acute suppurative parotitis. Staphylococcus aureus is the usual causative organism. Pleomorphic adenoma can arise from the parotid, submandibular or other minor salivary glands. Mucoepidermoid carcinoma is slow-growing but can invade the facial nerve. Histologically, there are areas of mucin-producing cells and the squamous cells.