“…36 Most Common Metastatic Tumors Causing AV Block The preponderant malignant tumors are melanoma [39][40][41][42] and lung. [39][40][41][43][44][45][46][47] Other more frequent metastatic neoplasm causing heart block include lymphoma, 41,43,48 breast, 40,41 esophagus, 43 stomach, 41 kidney, 40 and leukemia. 41 Most of these tumors have been diagnosed radiographically, by CT, magnetic resonance imaging, echocardiography, and positron emission tomography 40,42,44,45,47,49,50 and not pathologically.…”