Congenital left atrial appendage aneurysm can be diagnosed by fetal echocardiography and successfully treated with simple aneurysmectomy to relieve associated mitral regurgitation.
Aneurysmectomy alone may suffice in select congenital cases; leaves open need for prospective validation of durability.
A newborn infant was evaluated because of a large cystic mass adjacent to the left atrium on prenatal ultrasound. The diagnosis was an aneurysm of the left atrial appendage. Most cases of this rare lesion are recognized between the 2nd and 4th decades of life. The present case, however, was detected on fetal echocardiography. The patient showed significant mitral regurgitation caused by the compression of the left atrioventricular groove. Simple aneurysmectomy without mitral valvuloplasty was sufficient to relieve significant mitral regurgitation in this case.
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Cho et al. (2009) studied this question.
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