This document provides an overview of how different congenital heart diseases appear on chest x-rays. It describes the typical enlargements seen in different cardiac chambers and pulmonary vasculature for various conditions. For example, it notes that the right atrium is commonly enlarged in Ebstein's anomaly and atrial septal defects, while the left atrium may be enlarged in ventricular septal defects or patent ductus arteriosus. The document also discusses abnormalities in heart shape, such as a "boot"-shaped silhouette in tetralogy of Fallot. Overall, it serves as a guide for interpreting chest x-ray findings in the context of congenital heart disease.