We present a 77-year-old man suffer from suspected cardiac infiltration of diffuse large B-cell lymphoma manifesting as sustained ventricular tachycardia. Neither antiarrhythmic drugs nor defibrillation can terminate VT episodes. the ECG showed sustained wide QRS tachycardia with left bundle branch block (LBBB) morphology and QRS complex positive in lead I and aVL, which inferred the tachy-arrhythmia would originated from the anterior wall of the right ventricle, this was consistent with the exact location of the tracer high-uptake on prior PET-CT. Chemotherapy was started urgently, the electrical-storm was eliminated within 48 hours and did not recur during three months of follow up. We will discuss the clinical presentation, diagnostic procedure, treatment and some reflections.