Sialogram (Salivary Gland Contrast Scan) 

Why?

Obstruction of a salivary duct can occur due to stones or narrowings (strictures). These may not show up on other scans. A Sialogram shows the main duct and the branching system of smaller ducts very clearly. The cause of obstruction can usually be identified. Sometimes the obstruction can be treated at the same time.

How?

A small tube is inserted into the opening of the duct in the mouth a dye is injected. X-rays are then taken. Sometimes balloons can be used to stretch open strictures or retrieve stones.