Metanephric adenoma: case report and review of literature

ABSTRACT

Metanephric Adenoma [MA] is a histologically and clinically unique and rare benign renal epithelial tumour. Only a few reports are found in literature regarding this novel tumour entity. We report this neoplasm in a 40-year old male who presented with flank pain and microscopic haematuria. USG and operative findings were suggestive of Renal Cell Carcinoma. Microscopic examination showed a tumour composed of small bland cells forming small tubular structures in an acellular stroma. Occasional papillary formations were also seen but no blastema was identified. The case was finally diagnosed as Metanephric Adenoma. It has a histological similarity to developing metanephric tubular epithelium and is considered to represent the benign counterpart of Wilms' Tumour. The unique pathological features of Metanephric Adenoma should be recognised because of its invariable indolent clinicobiological behaviour