Nuclear Cardiology Case: A 60-year-old man was referred for an exercise dual-isotope study for evaluation of atrial fibrillation and exercise-induced left bundle branch block

A 60-year-old man was referred for an exercise dual-isotope study for further evaluation of atrial fibrillation and exercise-induced left bundle branch block. Representative perfusion images are displayed in addition to an image from the raw data. What non-myocardial abnormality is seen?
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