Up to Quiz Ref ID 75% of stenoses of the salivary ducts are located in the parotid duct, and these cause approximately 15% to 25% of all unclear salivary gland diseases.
1,2 Chronic parotitis is the major cause of this type of stenosis, but associations with allergic, infectious, granulomatous, and autoimmune diseases, as well as status after radiotherapy or radioiodine therapy, have also been reported.
3-5 Quiz Ref ID Ultrasonography is currently the diagnostic method of choice in our department. Ultrasonographic imaging of parotid gland stenosis shows a hypoechoic band on the masseter muscle, as evidence of dilation of the ductal system, and also hypoechoic parenchymal changes, as signs of obstruction of the gland.
6