Rare but deadly complication of<unk> l ablation
There have been reported cases with various ablation modalities (including radiofrequency ablation, cryoablation, high intensity focused ultrasound, and surgical ablation)
Incidence is low (<0.1%) 
Usually formed between esophagus and left<unk> m
Thought to be related to adverse healing secondary to esophageal injury during the ablation procedure
Atrio-esophageal fistula
Sepsis
Subglottic stenosis
Stroke/TIA
Tracheomalacia
GI bleed
Esophageal injury
Acute coronary syndromes 