NCIt definition : An uncommon exophytic papillary proliferation that involves mucosal surface epithelium
and salivary duct epithelium. It is exceptional among salivary gland neoplasms because
it manifests as an exophytic papillary excrescence of the mucosa, rather than as a
submucosal or intraglandular mass. It most often affects the hard or soft palate.
It is generally asymptomatic.;