Renal tumors: Age spectrum and histological distribution across childhood

Abstract

Abstract Background: The objective of this study was to identify the relationship between the histopathological distribution of renal tumors and the age parameter across childhood period and to compare that with the available literature. Methods: A total of 193 pediatric patients with renal tumors were classified into 5 groups as embryo, infant, early childhood, childhood, and adolescent. Age distribution, pathological types and clinical characteristics were summarized. Results: Among the 193 patients, 95.8% presented with malignant tumors, and 4.2% showed benign tumors. The prevalence of Wilms’ tumor (WT( and non-WT, were 63.7% and 36.3%, respectively. Non-WT patients included clear cell sarcoma of the kidney (CCSK), followed by rhabdoid tumor of the kidney (RTK), congenital mesoblastic nephroma (CMN), cystic partially differentiated nephroblastoma (CPDN), and renal cell carcinoma (RCC). Early childhood (89/193, 46.2%) was the most common period of onset, followed by infant (73/193, 37.9%), childhood (19/193, 9.8%), embryo (8/193, 4.1%) and adolescent (4/193, 2.0%). WT predominantly occurred in infant and early childhood and decreased among older age group. Non-WT occurred various period of onset and rather common during embryo. 10.9% of patients were asymptomatic at the time of diagnosis and that was significantly observed in non-WT (P=0.04). Conclusions: Age of onset is a highly significant factor for pediatric renal tumors. Relationship between age spectrum and pathological characteristics influences distinguishing the histopathological distribution of WT and non-WT.