👉 In medicine, a "precaval" is a term used to describe a type of blood vessel that is present in the lower part of the heart. It's typically found at the base of the heart and forms an important part of the heart muscle. The term "precaval" refers to the vessels that connect the left ventricle (the main pumping chamber of the heart) with the right atrium, which is a small opening in the upper portion of the left side of the heart.