A 14-year-old girl was referred for evaluation of aortic regurgitation. She had an episode of acute rheumatic fever at the age of 6 years that was managed elsewhere. Her parents denied any history of blunt trauma to the chest or long-standing fever other than rheumatic fever. There was no clinical or laboratory evidence of recurrence of rheumatic fever at presentation. Echocardiogram revealed thickened mitral valve, restricted mobility of posterior mitral leaflet and low moderate mitral regurgitation. The aortic valve was trileaflet with severe aortic regurgitation. Interestingly, however, the non-coronary cusp of the aortic valve was prolapsing into the left ventricle. The regurgitant jet was eccentric through the non-coapting right coronary cusp and the non-coronary cusp (Fig. 1a, online video 1). The non-coronary cusp was thick and redundant (Fig. 1b). The prolapse of the non-coronary cusp and non-coaptation was better visualised on multi-planar review of the 3D full-volume dataset (Fig. 2, online video 3). Aortic valve prolapse is not an uncommon mechanism of aortic regurgitation, most commonly being in association with bicuspid aortic valve [1]. In addition, association with ventricular septal defect, mitral valve prolapse, infective endocarditis, blunt trauma to the chest and Marfan syndrome is well known. In an elegant study by Vasan et al., only 2.5 % of patients with active carditis had aortic valve prolapse. On the other hand, none of the patients with the absence of active carditis had aortic valve prolapse [2]. It is extremely unusual, however, to have aortic valve prolapse causing aortic regurgitation in a patient with rheumatic heart disease, especially without active carditis [1, 2]. Understandably, the history of acute rheumatic fever alone may not be considered as evidence to support the underlying aetiology as rheumatic. However, in the presence of abnormalities of the mitral valve, trileaflet aortic valve and lack of support to any alternative aetiology, rheumatic heart disease is the most likely cause of aortic valve prolapse in this case. It is important to recognise aortic valve prolapse, as it entails the possibility of valve repair.
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