Arteriovenous fistula between descending aorta: and left inferior pulmonary vein

Abstract

Congenital systemic arteriovenous fistula arising from aorta and draining through the pulmonary vein to left atrium without lung sequestration is a rare vascular malformation [1,2]. On physical examination there is usually a continuous or systolic murmur. Clinical presentation depends upon the size and place of the vascular malformation [3]. If there is a suspicion of arteriovenous fistula on physical examination and echocardiography, multislice computed tomography angiography (CTA) can be helpful in confirming diagnosis and anatomic model, and choosing appropriate treatment modality [3,4]. We describe a rare case with arteriovenous fistula between thoracic aorta and left inferior pulmonary vein occluded with Amplatzer vascular plugs. A 20 month old girl with failure to thrive and cardiac murmur was referred by a pediatrician with suspected congenital heart diseases for an echocardiography. Her weight and height were 9 kg (<3% percentile) and 78 cm (10-25% percentile). Physical examination confirmed the presence of Grade III/VI systolic murmur heard on apical region and radiated to the mid scapular region posteriorly. There were a hyper dynamic pulse at the rate of 110/ min, forceful left ventricular apex impulse and mild hepatomegaly. There was no cyanosis or clubbing. Chest radiography showed mild cardiomegaly (cardio thoracic ratio 0.54) with increased pulmonary vascular markings especially in the lower left pulmonary region. The patient has mild congestive heart failure clinically. Echocardiography revealed left atrial and ventricular enlargement, moderately mitral valve regurgitation and increased blood flow into left atrium from enlarged left inferior pulmonary vein. An abnormal vessel that demonstrated a communication with the left inferior pulmonary vein was noted nearly to the left atrium. Diagnosis of the patient may be arteriovenous malformation/fistula but was not clear. Hence multislice CTA was done which revealed an abnormal communication, arteriovenous fistula, originating from thoracic aorta and draining into left inferior pulmonary vein (FIGURE 1 & VIDEO 1). The fistula drained through the left inferior pulmonary vein to the left atrium leading to left-to-left shunt. Lung had normal bronchial connection and pulmonary vasculature. Thoracic aortogram revealed an arteriovenous fistula originating from thoracic aorta and draining to left inferior pulmonary vein, and finally into left atrium (VIDEO 2). That was closed with embolization of Amplatzer vascular plugs. Post procedure Mustafa Kosecik