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Table 2 Anatomical changes and possible underlying mechanisms in the presence of PLSVC

From: Persistent left superior vena cava: clinical importance and differential diagnoses

Reported anatomical changes Possible underlying mechanisms
The decrease in RSVC dimensions Reduction of blood volume drained through RSVC
Decrease in mitral valve area Compression to the left atrium via dilated CS
Atrophy of the valves of cardiac veins such as Vieussens, Thebesian Increased blood volume draining into the CS
The presence of a common left pulmonary vein trunk Limited space caused by the dilated CS
Increase in heart weight
  1. PLSVC persistent left superior vena cava, RSVC right superior vena cava, CS coronary sinus