To date, our series at the University of Wisconsin (unpublished data) includes 31 patients with a mean follow-up of 14.3 months (range, 1-39). There were 21 men and 10 women, 16 tumors were on the right and 15 on the left side. Eighteen patients were treated retroperitoneal and 13 transperitoneally. The mean tumor size was 2.54 cm. A double freeze, active thaw technique was utilized with two 10-minute freeze cycles. Mean operating time was 136 minutes and the mean blood loss was 57 mL. The hospital stay was 1.9 days. Global complication rate was 6%. One patient with postoperative hemorrhage

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