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Angiographic-morphologic correlation was done on findings in 16 patients with proven prolapse of the posterior mitral leaflet and severe mitral regurgitation. A triscalloped bulge into the left atrium in the left ventriculogram taken in the right anterior oblique projection is caused by prolapse of all three scallops of the posterior mitral leaflet. The prolapsed middle scallop produces a central bulge, the prolapsed posteromedial commissural scallop a posteroinferior bulge ih tne area of the posteromedial commissure, and the prolapsed anterolateral commissural scallop an anterosuperior bulge in the anterolateral commissural area. The latter is often overlapped by the aortic root but if prominent, juts beyond it. Correlation proved that the diagnosis of individual scallop prolapse in this syndrome can be made accurately despite gross mitral regurgitation.Additional Indexing Words: Mitral click syndrome Ruptured chordae tendineae p ROLAPSE of the posterior leaflet of the mitral valve (PPML), causing regurgitation as well as life-threatening arrhythmias and sudden death, has been the subject of a number of recent reports.1-7 The spectrum of clinical signs in this syndrome varies from the presence of a nonejection systolic click with or without a systolic murmur, to the presence of severe mitral regurgitation with a holosystolic murmur and no click. Electrocardiographic findings characterized by ST and T wave changes in the inferior leads have been observed in some patients.From the

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