Liver / Oncology Thompson Retractor System Uncompromised Exposure for Liver Transplant / Resection Utilizing a bilateral retractor frame set up, the Thompson Liver / Oncology System provides surgeons with the ability to obtain stable, versatile retraction for liver transplants, liver resections, oncology, and obesity cases. Combined with Thompson Retractor’s expansive blade selection, the bilateral set up offers multi-planed retraction and unlimited flexibility for the most complex abdominal and pelvic cases.