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(A–a) Ectopic atrial rhythm. (A–b) Atrial tachycardia with 3:1 conduction. (A–c) Atrial fibrillation. (B–a) The widespread malignant tumor appeared as a light‐yellow color. (B–b, c) Histology showing that the malignant tumor cells had invaded a large amount of the right atrium (hematoxylin–eosin stain, magnification ×40, ×100).
