Fistulae Of The Salivary Ducts may follow traumatism or the perforation of an abscess. The parotid duct is the one generally involved.

Concretions or calculi are sometimes found; are called sialoliths. They are composed of phosphate and carbonate of calcium, and are found in the smaller as well as the main duct. They frequently give rise to retention cysts, the most common variety being that known as ranula, a term applied not only to a cystic condition of Nuhn's glands but of the sublingual as well.

Tumors of the salivary glands are not uncommon, the parotid being most frequently involved, the connective-tissue tumors, as fibroma, lipoma, chondroma, and sarcoma, being the most usual. Adenoma and primary carcinoma are unusual. The most common neoplasm is the mixed tumor of the parotid. This is composed of sarcomatous tissue, along with cartilage, mucous and fibrous tissue. It grows slowly, does not frequently give metastasis, and when excised seldom returns. It is probably the result of fetal inclusions taking place during the closure of the first branchial cleft.