PMC5835304_01
Ultrasonography of the left parotid gland.
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fig1
Ultrasound examination revealed a 3 cm polygonal hypoechoic lesion with well-defined smooth margins (Figure 1) so that our preoperative differential diagnosis included both benign and malignant neoplasms.
Microscopic image of the tumour of the left parotid gland (a, b), right parotid gland (c, d), and renal cancer (e).
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fig2
Therefore, the immunohistological staining presented a metastasis of a clear cell renal cell carcinoma and was consistent in its immunohistochemical pattern with the previously treated renal cell carcinoma (Figure 2).