Kneuertz PJ, Yudovich MS, Amadi CC, et al. - Researchers aimed at determining how pulmonary artery diameter (PAD) measured by computed tomography (CT) associates with outcomes following lobectomy. Reviewing records of patients undergoing pulmonary lobectomy for lung cancer, they identified a total of 736 lobectomy patients for inclusion, who had a preoperative CT scan (25% with contrast, 75% noncontrast) available for review. An enlarged main PAD ≥ 30 mm was identified in a total of 141 (19.2%) patients, and there were 58 (7.9%) patients who had a main PAD that was larger than the ascending aorta (PA/ascending aorta ratio > 1). Multivariable analysis revealed an independent correlation of surgical side PAD with major complication after adjusting for cardiovascular comorbidities, pulmonary function, and the operative approach. Based on findings, they suggest CT-based measurements of the PAD on the operative side as valuable for determining the risk of major complications after lobectomy. They suggest reviewing PA size on preoperative CT scans as possibly valuable to determine patients who would benefit from formal evaluation of PA pressures which may improve the operative risk assessment.