NPPB and cardiac amyloidosis: AV45 PET-CT suggested cardiac involvement, complete cardiac evaluation, no electrocardiogram abnormalities; troponin T 0.075 ng/mL, creatine kinase ioszyme mass 8.21 ng/mL, pro-brain natriuretic peptide (BNP) 5066 pg/mL; echocardiography: severe hypo-diastolic function of the left heart; cardiac amyloidosis screening speckle-tracking imaging analysis: overall longitudinal strain in the left ventricle was significantly reduced, bull’s-eye image showed preserved longitudinal strain in the left ventricular apical region, consistent with the manifestation of cardiac amyloidosis.