Metastasis of Clear Cell Renal Cell Carcinoma to the Parotid Gland: A Case Report

Parotid gland metastases from distant primary malignancies are uncommon and present diagnostic challenges for clinicians. We present the case of a 65-year-old male with a history of clear cell subtype of renal cell carcinoma who presented with a painless swelling in the right parotid region. His medical history was significant for a right-sided renal cell carcinoma, for which he had undergone a radical nephrectomy five years ago. The patient's physical examination revealed a firm, non-tender mass in the right parotid gland region. Imaging studies, including ultrasound and contrast-enhanced computed tomography, confirmed the presence of a solid-enhancing lesion within the parotid gland. Fine-needle aspiration biopsy provided histological evidence of malignant cells with features consistent with a clear renal cell carcinoma cell subtype. This is consistent with diagnosing metastatic renal cell carcinoma to the parotid gland. This case highlights the significance of considering metastatic disease in the differential diagnosis of parotid swellings, particularly in patients with a history of remote malignancy. Systemic targeted therapy, with a tyrosine kinase inhibitor, emerged as an effective treatment option, emphasizing the importance of personalized approaches in managing rare clinical scenarios. Tailored management is crucial in optimizing outcomes for patients with parotid gland metastases, improving their overall prognosis and quality of life.