A rare case of hypoplastic coronary sinus partially draining into right superior vena cava: A case report.

Hypoplastic CS though has no pathological significance in the normal population but for CRT it can become a significant limitation. Tributaries of CS draining into right SVC are the rarest of the finding, the channel draining most likely is a remnant of the splanchnic plexus around the embryonic foregut that usually has a temporary communication with cardinal veins during intrauterine growth. This communication somehow has persisted and resulted in a channel between coronary vein and the SVC, which may be referred to as coronary veno-cardinal vein.