Immunohistochemistry confirmed the presence of ATTR cardiac amyloid in all patients undergoing endomyocardial biopsy (6 out of 6, 100%) that had characteristic echocardiography and/or CMR for amyloidosis and Perugini grade 2 to 3 99mTc-DPD scintigraphy and a concomitant paraproteinaemia (monoclonal gammopathy of unknown significance). The gene discussed is TTR; the disease is monoclonal gammopathy.