Ultrasound Abnormalities of the Salivary Glands in Primary Sjögren's Syndrome According to the Duration of the Disease

Salivary gland ultrasonography is identified as a valuable diagnostic tool and potential criteria item for disease classification of sjögren's syndrome and evaluate evolution of parenchyma. The investigators have to include 242 patients. The objective is to evaluate the modification of ultrasonographic abnormalities according to disease in primary Sjögren syndrome.