Juxtaglomerular cell tumor diagnosed preoperatively by renal tumor biopsy.

INTRODUCTION: Diagnosis of small renal tumor from imaging analysis is limited. We report a case of juxtaglomerular cell tumor diagnosed preoperatively by renal tumor biopsy. CASE PRESENTATION: A 17-year-old male was urgently hospitalized for acute-onset congestive heart failure. Radiographic findings revealed a 2-cm mass lesion, and on renal biopsy, a juxtaglomerular cell tumor was suspected. The juxtaglomerular cell tumor was resected by laparoscopic partial nephrectomy, on suspicion of causing the heart failure. The patient's clinical symptoms improved drastically postoperatively. CONCLUSION: Biopsy may be a promising option for preoperative diagnosis of juxtaglomerular cell tumors.