Atypical Dilated and Nonhypertrophic Cardiac Transthyretin Amyloidosis: Concept of Overlapping Cardiomyopathies

Highlights

• Subtle age-related ATTR-CM can complicate preexisting other HF etiologies.
• Combined cardiomyopathies can present with atypical clinical/imaging presentation.
• Multimodal imaging assessment is required in overlapping cardiomyopathies.
• Absence of myocardial thickening should not rule out an infiltrative disorder.
• Endomyocardial biopsy remains important in the context of equivocal imaging.
  
  Keywords
• Cardiac amyloidosis
• Heart failure
• Dilated cardiomyopathy