Paraaortic infrarenal lymphadenectomy is indicated in patients with gynecologic tumors of high metastasising potential and can be done successfully by laparoscopic approach. Vascular anomalies in this region are incidental findings during these approaches and may increase the surgical complication rate. In this study, we have documented the frequency and pattern of the vascular anomalies in paraaortic region intraoperatively and on cadavers in an attempt to increase surgical safety. A total of 86 consecutive patients underwent laparoscopic infrarenal paraaortic lymphadenectomy by a standardised technique between 1st of January 2002 and 1st of March 2004. Of the 86, 52 were primary cervical, 5 recurrent cervical, 14 endometrial, 14 early ovarian and 1 vulvar tumor with positive groin and pelvic lymph nodes. In the same time, anatomical dissections of the paraaortic region on 18 cadavers were performed at the Institute of Anatomy. Arterial or venous abnormalities were identified in 30.2% (26/86) of patients by laparoscopy. The most frequent anomalies were related to atypical renal arteries (pole arteries- 9 patients) and an abnormal course of lumbar veins directly draining in the left renal vein (15 patients). In one of the patients, the complete left renal vein went retroaortic to the inferior vena cava. In cadaveric dissections, vascular anomalies were noted in 44.4% (8/18) which included variations in renal and lumbar vessels and ovarian vessels. Duplicated inferior vena cava was the least common anomaly and was detected in only one case. During laparoscopic paraaortic inframesenteric and infrarenal lymphadenectomy, care must be taken because of possible abnormalities in arterially and venous system to avoid massive hemorrhage, transfusion and conversion to laparotomy. Paraaortic infrarenal lymphadenectomy is indicated in patients with gynecologic tumors of high metastasizing potential and can be done successfully by laparoscopic approach. Vascular anomalies in this region are incidental findings during these approaches and may increase the surgical complication rate. In this study, we have documented the frequency and pattern of the vascular anomalies in paraaortic region intraoperatively and on cadavers in an attempt to increase surgical safety. A total of 86 consecutive patients underwent laparoscopic infrarenal paraaortic lymphadenectomy by a standardized technique between 1st of January 2002 and 1st of March 2004. Of the 86, 52 were primary cervical, 5 recurrent cervical, 14 endometrial, 14 early ovarian and 1 vulvar tumor with positive groin and pelvic lymph nodes. In the same time, anatomical dissections of the paraaortic region on 18 cadavers were performed at the Institute of Anatomy Arterial or venous abnormalities were identified in 30.2% (26/86) of patients by laparoscopy. The most frequent anomalies were related to atypical renal arteries (pole arteries-9 patients) and an abnormal course of lumbar veins directly draining in the left renal vein (15 patients). In one of the patients, the complete left renal vein went retroaortic to the inferior vena cava. In cadaveric dissections, vascular anomalies were noted in 44.4% (8/18) which included variations in renal and lumbar vessels and ovarian vessels. Duplicated inferior vena cava was the least common anomaly and was detected in only one case. During laparoscopic paraaortic inframesenteric and infrarenal lymphadenectomy, care must be taken because of possibleomalities in arterially and venous system to avoid massive hemorrhage, transfusion and conversion to laparotomy.