439 Vol. 9 | No. 1 | Winter 2012 | UROLOGY JOURNAL Keywords: collision tumor, cystic nephroma, neuroblastoma, childhood INTRODUCTION A collision tumor is present when two distinct primary tumors are found and a neuroblastoma. CASE REPORT - symptoms. On her physical examination, a mass at the right upper lateral abdo- men nearly 7 × 6 cm in diameter was palpated. Her past and family histories were unremarkable. The abdominal ultrasonography and tomography scan revealed a 93 × 75 × 81 mm mass in the right renal localization, which had a smooth surface and multiple septae with solid and cystic areas. The 24-hour urine sample examination revealed increased amounts of vanilylmandelic acid and homovanilic acid (2.8 mg/day and within normal limits. Right radical nephrectomy was performed and a mass at the inferior region of the right adrenal gland was removed. The renal tumor was well circumscribed with - Ceyhun Bozkurt, 1 Ulya Ertem, 1 Sema Apaydın, 2 Ferda Şenel, 3 Gürses Şahin, 1 Nazmiye Yüksek, 1 Sonay İncesoy Özdemir, 1 Esin Boduroğlu 2 Coexistence of Cystic Nephroma and Neuroblastoma A Rare Case of a Childhood Collision Tumor Corresponding Author: Ceyhun Bozkurt, MD Department of Pediat- ric Oncology, Dr. Sami Ulus Children’s Hospital, İlkbahar Mah. 590. sok. No: 9/7, 06550, Çankaya, Ankara, Turkey Tel: + 90 312 305 6061 Fax: + 90 312 317 0353 E-mail: bozkurt.ceyhun@ gmail.com Received January 2010 Accepted June 2010 1 Department of Pediatric Oncology, Dr. Sami Ulus Children’s Hospital, An- kara, Turkey 2 Department of Patholo- gy, Dr. Sami Ulus Children’s Hospital, Ankara, Turkey 3 Department of Urology, Dr. Sami Ulus Children’s Hospital, Ankara, Turkey Case Report