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TA III is a rare form of truncus arteriosus when the branch pulmonary arteries originate independently from the common arterial trunk or aortic arch, with origin of one pulmonary artery from the underside of the aortic arch from a ductus arteriosus. Accurate diagnosis and timing of surgery is essential for survival of neonates affected. Purpose Illustration of various imaging modalities utilized to diagnose and manage this lesion and the importance of spontaneous PDA closure. Results TAIII diagnosed at 24 weeks gestation by fetal echocardiography images 1,2,3. Baby was spontaneously delivered at term with 3 Kg weight and 8,9 Apgar score. Diagnosis was confirmed by transthoracic echocardiography images 4,5 , however on 7th day of life routine echocardiogram was performed to assess PDA , markedly decreased flow noted in LPA/left pulmonary veins and no PDA could be seen at that time images 5,6. Spontaneous ductal closure was confirmed by tomography image 7 then cardiac intervention performed to establish LPA patency image 8,9. Successful total repair was done within the neonatal period with excellent results at follow up ( image 10 at 3 years old). Conculsions 1- TAIII can can be diagnosed and assessed by echocardiography. 2- PDA patency to maintain LPA continuity is essential in TAIII management. 3- Successful total surgical repair with good outcomes can be achieved for neonates with this rare complex cyanotic CHD. Abstract P720 Figure. Images

european heart journal. cardiovascular imaging

P720 Antenatal and postnatal echocardiographic diagnosis of Truncus Arteriosus III (TAIII) complicated by spontaneous PDA (patent ductus arteriosus) closure and LPA (left pulmonary artery) disconnection