Two canine hearts with persistent left superior vena cava (PLSVC) were found among 22 normal canine hearts collected at the Heart Institute of Japan. They had no communication between the right and left superior vena cava (SVC). Therefore, they had bilateral SVC. LSVC was connected with the right atrium through the coronary sinus, taking the same course as the ligament of Marshall. In one case PLSVC was complicated with ventricular septal defect the other case was free from any associated lesion.
On the other hand, PLSVC was found in 51 of 1, 236 human specimens of congenital heart disease.
In 46 of the 51 cases, this anomalous vein was connected with the coronary sinus in the same mannet as in the dog. In the remaining five cases, PLSVC entered the left atrium (LA) directly.
No dogs have ever been reported up to the present to have PLSVC entering the LA.
This anomalous vein is not clinically significant unless it opens into the LA. Knowledge of its appearance will aid an angiocadiographic interpretation.
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