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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