CTICasesLeft Atrial Appendage Aneurysm
Imaging findings
A soft-tissue abnormality lies along the upper part of the heart, contrast-filled on CT, representing a hugely dilated left atrial appendage. The surrounding cardiac structures appear otherwise clean, without the changes of mitral valve disease or chronic left heart disease.
Key takeaways
Left atrial appendage aneurysm is a rare entity that may be congenital or acquired, with acquired causes accounting for roughly 90 percent — mitral valve disease, chronic left heart disease, atrial fibrillation, or myocarditis. In this patient of 21 or 22 with atrial fibrillation and flutter, increasing breathlessness, and tachycardia to 200 beats per minute, the youth of the patient and the otherwise normal-appearing heart favour a congenital aneurysm, with the arrhythmia following the aneurysm rather than causing it.
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