After resection and delivery of the resected specimen out of the patient, the specimen will be examined in vitro out of the operative field in a non-sterile field in the operative room. The lobar pulmonary artery and its main segmental branches will be dissected. Canulation of a major segmental branch will be performed using an arterial pressure monitoring catheter. The canulation will be secured with ligation of 2-0 silk suture. A three way valve will be attached directly to the arterial catheter. One branch of the three way valve will be attached to a controlled pressure syringe pump and the other branch will be attached to a digital manometer. All other segmental branches of the pulmonary artery will be ligated to maintain the pressure throughout the catheterized segmental branch. Normal 25 mmHg pressure will be obtained by inflating with normal saline. The lobar pulmonary artery and the main segmental branches' diameters will be measured using a digital caliper from the adventitia to the adventitia in the inflated portion with normal saline of pressure 25 mmHg. The lobar pulmonary artery and the main segmental arteries will be sealed using one of the main energy seals (Ligasure, Harmonic scalpel, Enseal, Thunderbeat, unipolar or conventional bipolar cautery or application of metal or Hem-o-lok clips). The sealing will be performed with a normal 25 mmHg intra-arterial pressure.