NCIt definition : A benign neoplasm that arises from the parotid gland. It is characterized by the presence
of multicystic formations, lined by neoplastic stratified squamous epithelium and
containing keratotic lamellae. The neoplastic squamous epithelial cells have bland
nuclei and abundant eosinophilic cytoplasm. Focally, solid islands of squamous cells
surrounded by collagenous stroma are present.;