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Figure 4 Transcatheter approaches of stent implantation. (a and b) pre- and post-stent implantation in tetralogy of Fallot-pulmonary atresia. A 6-F Guiding Judkin's Right catheter was passed through ventricular septal defect and anterogradely into ascending aorta with guide wire securely anchored in distal pulmonary artery; (c) normal ductus morphology in tricuspid atresia; (d) post-stent implantation by retrograde transarterial approach.