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A rare benign renal tumour presenting as polycythaemia in a teenage girl.Geoghegan, S; Fitzpatrick, J M; McGuire, B; O'Malley, K J; Shaw, C; Fabre, A; Department of Urology, Mater Misericordiae University Hospital, Eccles St, Dublin 7. (2010-04)We present the case of a 15-year-old girl who presented with polycythemia. CT abdomen revealed an enhancing mass in the upper pole of her left kidney with features suggestive of renal cell carcinoma. She underwent a laparoscopic radical nephrectomy. Histology demonstrated a well circumscribed, focally encapsulated, round blue cell tumour showing areas of microcalcifications and numerous psammoma bodies. Imunostaining showed diffuse positive staining for CD 57. This was consistent with a diagnosis of metanephric adenoma a rare benign epithelial renal tumour.