**3.3.3 Impact of tumour size**

Patel (Patel et al., 2010) described 71 transperitoneal robotic partial nephrectomies. On preoperative imaging, 15 were larger than 4 cm.

Peri-operatively, warm ischemia time was significantly longer in larger tumours. (p=0.011). He noted no intra-operative complications. The other peri-operative parameters: operative time, need to repair the collecting system, estimated blood loss, elective conversions were not significantly different between the smaller and the larger tumour groups. Postoperative complication rate was similar. There were also no differences in post-operative variables: length of stay and change of haemoglobine. Tumour size between 4 and 7.9 cm was not a risk factor for increased peri- and post-operative complications in patients undergoing robotic partial nephrectomy.
