metanephric adenoma

metanephric adenoma

A benign, well-circumscribed, non-encapsulated, usually unilateral tumour, that is often an incidental finding in asymptomatic patients.

Clinical findings
Haematuria, polycythaemia, palpable mass.

DiffDx
Papillary renal cell carcinoma, Wilms tumour.
References in periodicals archive ?
The positivity for cytokeratin 7, cytokeratin 8/18, and vimentin is useful in differentiating papillary RCC from other primary renal neoplasms, including metanephric adenoma, chromophobe RCC, oncocytoma, and urothelial cell carcinoma of the renal pelvis.
Metanephric adenoma is typically well circumscribed on gross examination and displays a solid, tan mass, similar to the solid variant papillary RCC.
Apart from these lesions, there are many kind of benign lesions (leiomyoma, metanephric adenoma, lipoma etc.
World Health Organization (WHO) histological classification of benign renal neoplasms Renal cell tumors Metanephric tumors Mesenchymal tumors Oncocytoma Metanephric adenoma Angiomyolipoma Papillary adenoma Metanephric adenofibroma Leiomyoma Metanephric stromal tumor Hemangioma Lymphangioma Reninoma Fibroma Schwannoma Renal cell tumors Mixed epithelial mesenchymal tumors Oncocytoma Cystic nephroma Papillary adenoma Mixed epithelial and stromal tumor