Crisscross heart is a medical condition where the heart's major vessels cross each other, forming an "X" shape. While this condition is typically seen in infants and children, it can occur in adults as well. There are several synonyms that can be used to describe this condition, including Malposition of Great Arteries, Transposition of Great Vessels, and Double Discordance. These phrases all describe the abnormal location of the heart's major vessels, leading to the crisscross pattern. Other related terms include Congenital Heart Disease, Complex Congenital Heart Defect, and Heart Abnormality. While there are varying degrees of severity when it comes to crisscross heart, early diagnosis and treatment are essential for better outcomes.