PATHOLOGY OF TRICUSPID-VALVE STENOSIS AND PURE TRICUSPID REGURGITATION .2.

This three-part article examines the histologic and morphologic basis for stenotic and purely regurgitant tricuspid valves. In Part I, condi tions producing tricuspid valve stenosis were reviewed, In Part II, co nditions producing pure tricuspid regurgitation are discussed. In cont rast to the relatively few causes of tricuspid stenosis, the causes of pure (no element of stenosis) tricuspid regurgitation are multiple. S ome of the conditions producing pure regurgitation include floppy tric uspid valves, infective endocarditis, papillary muscle dysfunction, rh eumatic disease, and Ebstein's anomaly.