An accessory left atrial appendage is a frequent fortuitous finding in cardiac imaging, encountered in ~10% of patients. They are more often seen as a small diverticular structure projecting from the right upper side of the left atrial wall.
Differential diagnosis
it must not be confused with interatrial septal aneurysm
also consider a left atrial diverticulum
References
Related Radiopaedia articles
Anatomy: Thoracic
thoracic skeleton[+]
muscles of the thorax[+]
spaces of the thorax[+]
thoracic viscera
tracheobronchial tree[+]
lungs[+]
heart
cardiac chambers
left atrium
left atrial appendage
accessory left atrial appendage
left ventricle[+]
right atrium[+]
right ventricle[+]
heart valves[+]
pectinate muscles
cardiac fibrous skeleton[+]
coronary arteries[+]
innervation of the heart
fetal circulation[+]
pericardium[+]
esophagus[+]
thymus[+]
breast[+]
blood supply of the thorax[+]
lymphatics[+]
innervation of the thorax[+]
Differential diagnosis
it must not be confused with interatrial septal aneurysm
also consider a left atrial diverticulum
References
Related Radiopaedia articles
Anatomy: Thoracic
thoracic skeleton[+]
muscles of the thorax[+]
spaces of the thorax[+]
thoracic viscera
tracheobronchial tree[+]
lungs[+]
heart
cardiac chambers
left atrium
left atrial appendage
accessory left atrial appendage
left ventricle[+]
right atrium[+]
right ventricle[+]
heart valves[+]
pectinate muscles
cardiac fibrous skeleton[+]
coronary arteries[+]
innervation of the heart
fetal circulation[+]
pericardium[+]
esophagus[+]
thymus[+]
breast[+]
blood supply of the thorax[+]
lymphatics[+]
innervation of the thorax[+]
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