A salivary diverticulum (plural diverticuli) is a small pouch or out-pocketing of the duct system of a major salivary gland.[13] Such diverticuli typically cause pooling of saliva and recurrent sialadenitis,[14] especially parotitis.[15] A diverticulum may also cause a sialolith to form.[16][17] The condition can be diagnosed by sialography.[14] Affected individuals may "milk" the salivary gland to encourage flow of saliva through the duct.[14]