ISPUB.COM The Internet Journal of Thoracic and Cardiovascular Surgery Volume 6 Number 2 1 of 4 Extralobar Pulmonary Sequestration With Anomalous Blood Supply From The Subclavian Artery S Gürkök, A Gözübüyük, M Dakak, H Caylak, O Yücel, M Öztürk, O Genc Citation S Gürkök, A Gözübüyük, M Dakak, H Caylak, O Yücel, M Öztürk, O Genc. Extralobar Pulmonary Sequestration With Anomalous Blood Supply From The Subclavian Artery. The Internet Journal of Thoracic and Cardiovascular Surgery. 2003 Volume 6 Number 2. Abstract Pulmonary sequestration is a rare embryonic mass of lung tissue that has no identifiable bronchial communication and that receives its blood supply from one or more anomalous systemic arteries. Systemic blood supply is commonly from the thoracic aorta. Venous drainage is commonly to systemic pulmonary vessels. A healthy, asymptomatic 20 year-old male was admitted to our hospital for evaluation of a left sided mass. The standard chest roentgenograms, a contrast-enhanced chest tomography, a bronchoscopic examination, thoracic magnetic resonance imaging and a selective angiography were performed. With these findings we decided that this heterogeneous lesion between mediastinum and left upper lobe as extralobar pulmonary sequestration. The patient underwent left sided posterolateral thoracotomy. We performed sequestrectomy. Postoperative period was uneventful. INTRODUCTION Pulmonary sequestration is an uncommon congenital pulmonary malformation, characterized by a mass of non- functioning lung tissue, which is separated from the normal bronchopulmonary tree. Anatomically, it is classified into two types, intralobar (ILS) and extralobar (ELS). Systemic blood supply is commonly from the thoracic aorta, but arteries may occasionally arise from other sites including the abdominal aorta, intercostal arteries, internal mammarian artery, subclavian artery or from circumflex coronary artery, rarely. Venous drainage is commonly to systemic pulmonary vessels, but variable drainage may be to superior and inferior cava, brachiochephalic or azygous vena. In the ILS, the malformation is incorporated in the normal pulmonary parenchyma of a lobe. The ELS consists of pulmonary parenchyma separated from the rest of the lung by its own pleural envelope and corresponds to a true accessory lung [ 1 , 2 , 3 ]. This present study aimed to report extraordinary located extralobar pulmonary sequestration arising from the subclavian artery CASE REPORT A 20 year-old male was admitted to our hospital for evaluation of a left sided cystic lesion. He was healthy and asymptomatic and had no previous history of respiratory symptoms. His body physical examination was normal. The standard chest roentgenograms showed a rounded density on the left upper lobe adjacent to aortic arch. A contrast- enhanced chest tomography was performed (Figure 1). Figure 1 Figure 1: Chest tomography Tomography demonstrated a heterogeneous high-attenuating non-enhancing mass with irregular multi cystic parameter on the anterior mediastinum broad to left upper lobe with dimension 6x4x5 centimeters. This lesion was between manubrium sterni, pericardium and posterior segment of left