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Figure 3: Virtual dissection obtained from diastolic phase of CT angiogram shown in short-axis plane and seen from head end of the patient. (a) Asymmetric trisinusate truncal valve with the pulmonary arterial segment arising from the largest left sinus in patient 1. (b) A trisinusate valve but with symmetric sinuses in a patient with no pulmonary obstruction. LPA: Left pulmonary artery; RA: Right atrium; RPA: Right pulmonary artery; TrV: truncal valve

Figure 3: Virtual dissection obtained from diastolic phase of CT angiogram shown in short-axis plane and seen from head end of the patient. (a) Asymmetric trisinusate truncal valve with the pulmonary arterial segment arising from the largest left sinus in patient 1. (b) A trisinusate valve but with symmetric sinuses in a patient with no pulmonary obstruction. LPA: Left pulmonary artery; RA: Right atrium; RPA: Right pulmonary artery; TrV: truncal valve