Tricuspid valve prolapse

In medicine, prolapse is a condition in which organs fall down or slip out of place. It is used for organs protruding through the vagina, rectum, or for the misalignment of the valves of the heart. [Source: Wikipedia ]

OrphaNet reference
Tricuspid valve prolapse 
May Cause
Tricuspid insufficiency
May Be Caused by
Mucolipidosis type 3