<prompt> Answer this question truthfullyCan you provide a summary of parotitis?  <response>: <reason> Parotitis must be differentiated from other diseases that present edematous swelling in the throat and neck. Diseases include retropharyngeal abscess, angioneurotic edema, salivary gland neoplasia, Sjögrens syndrome, and sialolithiasis and sialadenitis of the submandibular glands. 