Cor biloculare, also known as bilocular heart, is a medical condition characterized by the presence of two atria and ventricles in the heart. Synonyms for cor biloculare include biatrial heart, biventricular heart, and double heart. This condition is usually seen in individuals with other congenital heart defects. The symptoms of cor biloculare are similar to other heart defects and may include shortness of breath, fatigue, and swelling in the legs or abdomen. Treatment for cor biloculare typically involves surgical intervention to repair the defect and manage any associated complications. Early diagnosis and treatment are essential for individuals with cor biloculare to live a healthy and fulfilling life.