Central   Journal of Urology and Research Cite this article: Kaynak Y, Kaya C, Hacioglu BA, Aynaci M (2016) Primary Retroperitoneal Mucinous Cystadenoma Resected Retroperitoneoscopically. J Urol Res 3(1): 1043. *Corresponding author Yurd a e r Ka yna k, De p a rtm e nt o f Uro lo g y, Eskise hir State Hospital, VişnelikMah. Erkan Sk. No: 43 Odunpazarı/ Eskişehir, Turkey, Tel: 90-4522927784; Fax: 90-0222-2376234; Email: yurdaerkaynak@ hotmail.com Submitte d: 05 November 2015 Accepted: 12 January 2016 Publishe d: 14 January 2016 ISSN: 2379-951X Copyright © 2016 Kaynak et al. OPEN ACCESS Ke ywo rds • Laparoscopy • Tumor • Treatment • Resection Case Report Primary Retroperitoneal Mucinous Cystadenoma Resected Retroperitoneoscopically Yurdaer Kaynak 1 *, Coskun Kaya 1 , Buket Altunkara Hacioglu 2 and Murat Aynaci 3 1 Department of Urology, Eskisehir State Hospital, Turkey 2 Department of Pathology, Eskisehir State Hospital, Turkey 3 Department of Radiology, Eskisehir State Hospital, Turkey Abstract Introduction: Primary retroperitoneal tumor of mucinous type is extremely rare and has three subtypes as benign, borderline and cyst adenocarcinoma. Prompt diagnosis of the retroperitoneal tumors is important as the majority is malignant. Despite useful radiologic, laboratory and serologic investigations, a preoperative confdent diagnosis is diffcult. Therefore, surgical complete excision is recommended. Case report: 34 years old woman presented to our hospital with chronic, blunt, right fank pain for one year. On physical examination, an elastic soft tumor was palpable on her right lower abdomen. Routine laboratory tests were unremarkable. There was a retroperitoneal cystic mass in the abdominal ultrasonography. Non- contrast computed tomography revealed homogeneous, retroperitoneal cystic mass without solid components and with calcifcations near the lower pole of the right kidney. Retroperitoneoscopic resection of the tumor was performed. The patient was discharged at the second postoperative day. Pathological diagnosis was primary retroperitoneal mucinous cyst adenoma (PRMC). She was free of recurrence 6 months after surgery. Conclusion: The PRMC are rare tumors, don’t diagnose easily and don’t be known the etiology. When a cystic mass is determined in the retroperitoneal area; the PRMC should be taken in consideration in the differential diagnosis and may be successfully treated retroperitoneoscopically with no recurrence at the follow-up. ABBREVIATIONS PRMC: Primary Retroperitoneal Mucinous Cystadenoma CA: Carbohydrate Antigen CEA: Carcino-Embryonic-Antigen INTRODUCTION Primary retroperitoneal mucinous cystadenoma (PRMC which is extremely rare and has three subtypes as benign, borderline and cyst adenocarcinoma is a type of retroperitoneal tumors. To our knowledge, there are only 30 cases benign PRMC [1, 2] and only one case treated by retroperitoneoscopically in the English literature [3]. After obtaining her informed consent for the case report to be published, we present 31 th benign PRMC and the second case which was treated laparoscopically by retroperitoneal approach. CASE PRESENTATION 34 year old woman presented to our hospital with chronic, blunt, right flank pain for one year. On physical examination, an elastic soft tumor was palpable on her right lower abdomen and routine laboratory tests were unremarkable. The level of Carbohydrate Antigen (CA 19-9), CA 125 and Carcino-Embryonic- Antigen (CEA) were normal. There was a cystic mass pushing back the right kidney, measuring 10*7 cm in the abdominal ultrasonography. Non-contrast computed tomography revealed homogeneous, thin-walled, unilocular retroperitoneal cystic mass without solid components and calcifications that measured 9*6 cm near the lower pole of the right kidney (Figure 1a,b). The definitive preoperative diagnosis could not be established with these findings. Laparoscopic resection of the tumor by the retroperitoneal approach was performed. A 10-mm trocar was placed the tip of the 12 th rib as a camera port after dissection of the retroperitoneum by preperitoneal balloon dissector. The second 12-mm trocar was inserted just 2 cm above the right anterior iliac spine on the posterior axillary line and the third 5 mm trocar