Wiktionary
pneumoparotitis
n. A disorder characterised by the presence of air in the parotid gland.
Wikipedia
Pneumoparotitis
Pneumoparotitis (also termed pneumosialadenitis wind parotitis, surgical mumps, or anaesthesia mumps), is a rare cause of parotid gland swelling which occurs when air is forced through the parotid (Stenson) duct resulting in inflation of the duct.