[Systolic prolapse ("ballooning") of the mitral valves with secondary atrial septal defect: a still not much known combination].

Two case with the combination of a ballooning mitral valve and a secundum type ASD are described. The possibility of correct identification of the two anomalies by using relatively simple noninvasive methods is emphasized. Furthermore, a short review of the etiology of the clinical "mid systolic click/late systolic murmur" syndrome is given and the evidence for and against the existence of a true congenital combination of the two abovementioned defects is discussed.