After resection and removal of the resected specimen, the specimen will be examined ex-vivo, out of the operative field in a non-sterile field in the operative room. The lobar PA and its main segmental branches will be sharply dissected. Cannulation of a major segmental PA branch will be performed using our pressurization and monitoring device. The cannulation will be secured with a 2-0 silk suture. The vascular pressurization and recording device has been described in section E and is outlined in Figures 4 and 5. All pressure measurements will be recorded and graphed related to time from initial vascular pressurization to PA bursting pressure.