Fig. 4
![Fig. 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs43054-020-00041-z/MediaObjects/43054_2020_41_Fig4_HTML.png)
Ultrasonography shows normal right parotid gland with homogenous echogenicity. The parotid duct was not dilated and no residual calculus are seen
Ultrasonography shows normal right parotid gland with homogenous echogenicity. The parotid duct was not dilated and no residual calculus are seen