A Review of Metastatic Tumours of the Kidney with Literature: A Single Centre Experience

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Abstract
Objective: Metastatic tumors of the kidney are quite rare. In this study, we aimed to increase awareness by discussing the clinicopathological data of our cases in the context of the literature. Materials and Methods: A total of 760 cases, subjected to trucut biopsy or resection, were examined. The primary diagnoses, clinical, and histopathological features of the cases were investigated. Results: The study included 60 trucut and 700 partial/radical nephrectomy cases, with metastasis to the kidney detected in 24 cases. The most common primary organ was the lung, with less frequent cases from lymph nodes, skin, breast, nasal sinus, gall bladder, pleura, prostate, colon, esophagus, stomach, and ovary. Most tumors were of epithelial origin. The majority of the cases were solitary and endophytic in appearance. Kidney metastasis occurred at a median of 36 (2-123) months after the primary diagnosis. The median survival time after kidney metastasis was 8 (1-90) months. Conclusion: In this study, detailed demographic and pathological data of cases metastasizing to the kidney were documented. Although the rate of metastatic tumors in the kidney is low, even in solitary and endophytic appearances, the possibility of metastasis should be considered, especially in elderly patients, and confirmed with histopathological findings.

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