Which congenital heart defect is an exception to the rule and does not start with a T?

In the context of congenital heart defects, there is a common mnemonic that associates several conditions with the letter "T," often used to remember defects like Tetralogy of Fallot, Transposition of the Great Vessels, and Truncus Arteriosus. However, Left Ventricular Hypoplastic Syndrome is indeed an exception to this rule as it does not begin with the letter "T."

This condition is characterized by the underdevelopment of the left side of the heart, which leads to inadequate blood flow due to the reduced capacity of the left ventricle to pump blood effectively. It requires timely intervention, often including a series of surgical procedures to improve blood flow and increase oxygen delivery to the body.

While other defects listed might follow the "T" convention, Left Ventricular Hypoplastic Syndrome stands out exactly because it does not conform to this commonality, making it the correct choice in this context.