Large main pulmonary artery

A pulmonary artery is an artery in the pulmonary circulation that carries deoxygenated blood from the right side of the heart to the lungs. The largest pulmonary artery is the main pulmonary artery or pulmonary trunk from the heart, and the smallest ones are the arterioles, which lead to the capillaries that surround the pulmonary alveoli. [Source: Wikipedia ]

May Be Caused by

Common: Anemia; Atrial septal defect; Chronic heart disease; Cor pulmonale; Diffuse lung disease; Fluid overload; Heart failure; High output heart disease; Idiopathic; Mitral insufficiency; Mitral stenosis; Normal finding in adult women under 25; Obesity; Patent ductus arteriosus; Pregnancy; Pulmonary arterial disease; Pulmonary arterial hypertension; Pulmonary artery aneurysm; Pulmonary embolism; Pulmonary hypertension; Pulmonic stenosis; Thyrotoxicosis; Ventricular septal defect
Uncommon: Absent pulmonary valve; Aortopulmonary fistula; Aortopulmonary window; Atrioventricular canal defect; Cardiac neoplasm; Coarctation of pulmonary artery; Congenital absence of the pericardium; Cor triatriatum; Coronary artery fistula to right atrium; Coronary artery fistula to right ventricle; Coronary artery-pulmonary artery fistula; Double outlet right ventricle; Eisenmenger syndrome; Endomyocardial fibrosis; Hypoplastic left heart syndrome; Left atrial myxoma; Marfan syndrome; Parachute mitral valve complex; Pulmonary insufficiency; Tricuspid atresia without pulmonary stenosis; Trilogy of Fallot; Truncus arteriosus