We present a patient who was on active surveillance for lung adenocarcinoma and hypertrophic septal cardiomyopathy (HCM), was referred for cardiac magnetic resonance (CMR) assessment for risk stratification due to HCM. CMR revealed a large myocardial metastasis obstructing mid-apical left and right ventricular cavity. Any wall thickening in oncology patients should prompt to perform further imaging before establishing certain diagnosis.