Accessory left atrial appendage
Post-surgical state due to Stanford A aortic dissection graft repair. Suddenly noticed septae in atrial septae by follow up ultrasound.
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4mm triangular-shaped outpouching from the superomedial wall of the left atrium, which has a wide base and smooth margins consistent with a left atrial accessory appendage.
Aortic size is within its normal limits. Poststernotomy wires are noted.
High-resolution cardiac CT represents a unique and non-invasive tool to assess subtle anatomic cardiac anatomy and morphology. According to studies accessory left atrial appendages and diverticula can be found in more than one-fifth of subjects undergoing cardiac CTA and are more common in men.
Accessory left atrial appendages tend to be smaller than diverticula and are more commonly found on the left lateral atrial wall.