Overview
Metanephric adenoma is a rare benign renal neoplasm typically affecting adults, often incidentally discovered in the fifth decade. It can present with hematuria, palpable mass, flank pain, polycythemia, and hypercalcemia, though atypical presentations such as chyluria in pediatric patients are exceptionally rare 1.Diagnosis
Imaging: CT or MRI showing a well-defined, solid mass with characteristic features 1.
Biopsy: Histopathological examination confirming the presence of clear cells with minimal atypia and distinct architecture typical of metanephric adenoma 1.
Laboratory tests: Elevated serum calcium or hematocrit levels may be observed in symptomatic cases 1.
Chyluria: Rarely reported, particularly in pediatric cases, requiring differentiation from other causes 1.Management
Surgical excision: Complete resection is the primary treatment, often curative 1.
Follow-up imaging: Post-operative imaging to ensure complete removal and monitor for recurrence 1.
No specific adjuvant therapy: Generally not required for benign metanephric adenomas 1.Special Populations
Pediatrics: Presentation can be atypical, as seen in a case of chyluria in a 5-year-old 1.
No specific guidelines for elderly or comorbid conditions mentioned 1.Key Recommendations
Confirm diagnosis through histopathological examination post-biopsy 1 (Evidence: Moderate).
Perform complete surgical excision for definitive treatment 1 (Evidence: Moderate).
Monitor pediatric patients closely for atypical presentations like chyluria 1 (Evidence: Weak).References
1 McNeil JC, Corbett ST, Kuruvilla S, Jones EA. Metanephric adenoma in a five-year-old boy presenting with chyluria: case report and review of literature. Urology 2008. link