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In connection with 141 cases of parotid tumours, 21 adenopathies of the parotid region and 22 cases of parotitis, the authors define the role of ultrasonography in the exploration of the salivary glands. Use of simple criteria permits differentiation of benign from malignant tumours with a good degree of sensitivity (79.8% in our series). This score allows ultrasonography to be offered as the first complementary examination when dealing with a tumefaction of the parotid region. When ultrasonographic findings evoke a malignant lesion, a CT scan seems necessary to evaluate any extension in depth. In contrast, ultrasonography does not appear justified in cases of parotitis or lithiasic pathologies.