Fig. 1From: Correlation between CO2 storage at the last minute of gas insufflation and area of retroperitoneal lacuna during retroperitoneal laparoscopic radical nephrectomyComputation of the area of retroperitoneal lacuna. “R” refers to long diameter of balloon, “r” refers to wide diameter, and “h” refers to high diameter. “X” refers to X axis, and “y” refers to y axisBack to article page