Ultra-High Frequency Ultrasonography in Sjögren's Syndrome

Patients will undergo ultra-high frequency ultrasonography (70 MHz) of minor salivary glands, and the scans will be assessed using the OMERACT scoring system. Score 0 will be assigned in the presence of normal glandular tissue, Score 1 will correspond to mild glandular alteration, fine echogenicity or diffuse hypo-echogenicity, Score 2 will be assigned to moderate glandular alteration and focal hypoechoic areas with partial conservation of normal parenchyma, while in Score 3 diffuse presence of hypoechoic areas in the absence of normal glandular parenchyma with glandular fibrosis will be observed.