Radiofrequency ablation of left atrial flutter mediated with double potentials in a seemingly normally structured heart.

•An unusual left AFL circuit was not always confined to a perimitral circuit.•The isthmus with the DPs is located in the anterior wall near the mitral annulus.•The anterior wall displayed a low-voltage area matched with the LA–aorta contiguity.•The successful site of ablation was within an area with the DPs.