[Intraoperative sonography to localize a kidney tumor].

The authors present the case of a 61-year old man with microhematuria, in whom the preoperative diagnostic work-up (urography, percutaneous sonography, CT, retrograde pyelogram) had led to the diagnosis of a right sided renal tumour. Intraoperatively a kidney tumour was neither seen nor palpated. However, the mass was clearly outlined by intraoperative sonography. The following nephrectomy revealed an intrarenal adenocarcinoma of the kidney of 2.5 cm diameter.