Right Upper Lobe Partial Anomalous Pulmonary Venous Connecti
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Partial anomalous pulmonary venous connection (PAPVC) is an uncommon congenital anomaly in which one or more pulmonary veins drain into a systemic vein or the right atrium rather than the left atrium. Anomalous right-sided pulmonary veins might drain into the superior vena cava, inferior vena cava, right atrium, azygos vein, portal vein, or hepatic vein. Besides, anomalous left-sided pulmonary veins could drain into the left brachiocephalic vein, coronary sinus, or hemiazygos vein. The PAPVC might occur as an isolated anomaly or might be combined with atrial septal defect. The PAPVC to the superior vena cava occurs in about 10–15% of all patients with ASD.

We report a case of a 45-year-old male with PAPVC that was incidentally discovered during a right lower bilobectomy for lung cancer.

Case Report
A 45-year-old male had a persistent cough for two months and his chest X-ray showed a nodule in the right lower lobe. A chest computed tomography revealed a mass (5.8 × 6.6 × 6.3?cm) in the right lower lobe that was attached to the right hilum and around the bronchus. Bronchoscopy showed a lesion at the entrance of the right lower lobe that obstructed 30% of the bronchus and pathological examination of a biopsy revealed adenocarcinoma. Spirometry revealed the following values of FVC: 3.17?L (60%) and FEV1: 2.79?L (77%), while electrocardiography showed normal cardiovascular activity. Clinical examination did not reveal marked abnormalities or evidence of vascular shunt. Surgery was performed through a left posterolateral thoracotomy under one-lung ventilation. An anomalous pulmonary vein was incidentally discovered and the right upper lobe vein drained into the superior vena cava. A right bilobectomy was performed. The right upper lobe with the anomalous variation remained as it was.....