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JUXTAGLOMERULAR CELL TUMOR

A left kidney tumor was found in a 33 years old female with diastolic hypertension and hyperreninemia. A yellowish white 6 × 4 cm tumor with capsule was located in the upper pole. Polygonal mesenchymal cells with Bowie‐positive and rhomboid‐shaped granules and occasional tubular component were identified. The diagnosis of J‐G cell tumor was made. The first electron microscopic observation of the tubular epithelium showed immature features.50–100 A microfilaments in the epithelium were identical to those reported in epithelium of Wilms' tumor. The results support that the tubular component is a tumor constituent and that the case is a biphasic tumor. Biphasic pattern and clinical characteristics of reported J‐G cell tumor with tubular component are those of mesoblastic nephroma and adult multllocular cystic nephroma. Therefore, J‐G cell tumor with tubular component would have to be classified as a metanephric blastema origin tumor as like Wilms' tumor, mesoblastic nephroma, and multllocular cystic nephroma.