TOPICS: Parotid, sublingual, submandibular, mumps, bilateral inflammation, otitis, pancreatitis, aseptic meningitis, MMR vaccination, crowded living environments, college dorms, sialadenitis, unilateral, sialolithiasis, s. aureus infection, pleomorphic adenoma, stromal cells, myoepithelial cells, recurrence, facial nerve damage, warthin tumor, papillary cystadenoma lymphomatosum, abundant lymphocytes, germinal centres, smokers, mucoepidermoid carcinoma, squamous cells, goblet mucin-secreting cells, facial nerve damage