The diagnostic spectrum of EBUS has rapidly evolved since its inception in 2001 including its utility in diagnosis of pulmonary thromboembolism and tumor embolism.2,3 A correlation between dimensions of airway, measured on EBUS and CT scan, has been described.4 We found a significant correlation between the parameters measured by CT scan and EBUS. However, the limits of agreement were wide (approximately 30% of the vascular diameters). Hence, measuring the dimensions of great vessels through EBUS is unlikely to contribute significantly in the management of pulmonary hypertension. Importantly, it was difficult to assess the diameter of the main PA as it would not fit into the scanning range of EBUS. Due to the small sample size, larger studies are required to confirm our observations.