RT Journal Article SR Electronic T1 Intraoperative left ventricular perforation with false aneurysm formation. JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 1154 OP 1159 DO 10.1136/hrt.38.11.1154 VO 38 IS 11 A1 G P Sharratt A1 J K Ross A1 J L Monro A1 A M Johnson YR 1976 UL http://heart.bmj.com/content/38/11/1154.abstract AB Two cases of perforation of the left ventricle during mitral valve replacement are described. In the first case there was perforation at the site of papillary muscle excision and this was recognized and successfully treated. However, a true ventricular aneurysm developed at the repair site. One month after operation rupture of the left ventricle occurred at a second and separate site on the posterior aspect of the atrioventricular ring. This resulted in a false aneurysm which produced a pansystolic murmur mimicking mitral regurgitation. Both the true and the false aneurysm were successfully repaired. In the second case perforation occurred on the posterior aspect of the atrioventricular ring and was successfully repaired. However, a false ventricular aneurysm developed and ruptured into the left atrium producing severe, but silent, mitral regurgitation. This was recognized and successfully repaired. The implications of these cases are discussed.