431C arotico-azygous fistula is an extremely rare form of arteriovenous fistula, resulting from an abnormal communication between the carotid artery and azygous vein (1-4). As a result of continuous murmur, which is a typical physical finding of these vascular malformations, a caroticoazygous fistula could be confused with patent ductus arteriosus. Transcatheter coil embolization of these fistulas has been reported previously (5).Here, we describe a five-year-old boy with caroticoazygous fistula, who also had patent ductus arteriosus, the main cause of misdiagnosis, and successful transcatheter embolization with the Amplatzer ® Vascular Plug 1 (AVP 1).
Case reportA five-year-old boy was referred to our clinic with cardiac murmur. He had no history of any complaint. During physical examination, a continuous murmur was heard in the left chest area. Electrocardiogram and telecardiography were normal. Color and continuous wave Doppler echocardiography showed patent ductus arteriosus with dilated left atrium and left ventricle. Left atrium-to-aortic root diameter ratio was 1.7. He underwent cardiac catheterization and descending aorta angiography, focusing only on possible patent ductus arteriosus arising from the aorta. Patent ductus arteriosus was detected by angiography. The narrowest diameter of patent ductus arteriosus was measured as 2.3 mm. A detachable coil, 5 mm in diameter and having five loops (William Cook Europe, Bjaeverskov, Denmark), was used for occlusion of patent ductus arteriosus. No residual shunt was observed in control angiography (Fig. 1). During examination on the next day, a continuous murmur was still heard in the same area, but no residual shunt was detected by echocardiography. A chest X-ray confirmed that the coil had not migrated. We then highly suspected an arteriovenous fistula but it was not revealed by echocardiography. Therefore, other reasons for the continuous murmur were investigated. Initially, cranial computed tomography with contrast and abdominal Doppler ultrasound were performed to reveal a fistula in those areas, but the results were normal. We then decided to perform further cardiac catheterization. During the second cardiac catheterization procedure, aortic angiography detected a fistula tract between the carotid artery and azygous vein (Fig. 2).Aortic and subsequent selective angiography in anteroposterior and lateral views showed multiple branches of the vertebral arteries linking the fistula tract. It had a tortuous course, and the narrowest part measured 3.4 mm (Fig. 2). The calculated pulmonary to systemic blood flow ratio was 1.7.Lateral selective descending angiography was performed to delineate the fistula tract (Fig. 2a). The fistula tract had several connections to ABSTRACT We present the case of a five-year-old boy with a caroticoazygous fistula, which is an extremely rare congenital vascular malformation. The patient also had patent ductus arteriosus, a common cause of continuous murmur. The murmur continued despite successful coil embolization of the ductus. ...