Fig 1.
A 45-year-old woman with category 1 on US and normal parotid parenchyma in histopathology.
On the longitudinal gray-scale sonogram (A), a Warthin’s tumor (arrows) in the right parotid gland is observed, and the right parotid gland (arrowheads) shows normal parenchymal echogenicity, fine parenchymal echotexture, normal gland size, and a smooth margin. On the longitudinal color Doppler sonogram (B), normal parenchymal vascularity is observed. In the histology slide (C), the right parotid gland shows a normal parenchyma with serous acini and no inflammatory cells (hematoxylin and eosin stain, ×100).
Fig 2.
A 55-year-old man with category 3 on US and autoimmune parotitis in histopathology.
On the longitudinal gray-scale sonogram (A), a benign mixed tumor (arrows) in the right parotid gland is observed, and the right parotid gland (arrowheads) shows decreased parenchymal echogenicity, coarse parenchymal echotexture, normal gland size, and a smooth margin. On the longitudinal color Doppler sonogram (B), normal parenchymal vascularity is observed. In the histology slide (C), marked loss of glandular acini and dilated ducts surrounded by dense lymphoid cells are noted (hematoxylin and eosin stain, ×100).
Table 1.
Frequency analysis of ultrasound features of the normal parotid parenchyma and diffuse parotid disease in 98 patients.
Fig 3.
Comparison of diagnostic performance of each independent ultrasound (US) predictor for detecting diffuse parotid disease (DPD).
For the US categorization, category 3 (≥2 abnormal US features) was used as a cut-off value. The diagonal line represents 50% of the area under the receiver operating characteristic (ROC) curve and refers to a hypothetical marker that has no discriminatory power for differentiating DPD from normal parotid parenchyma.
Table 2.
Diagnostic performance of individual ultrasound features and ultrasound-based categorization for the detection of diffuse parotid disease in 98 patients.