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All four cardiac chambers have thickened walls, including the atria and atrial septum, which alone is very suggestive of amyloidosis, even without other findings.
The hallmarks of restrictive cardiomyopathy are thickened cardiac walls (due to infiltration) and restricted diastolic filling of the ventricles (we usually look at left ventricle closer) with lowered EF (as opposed to unaltered or even increased EF with hypertrophic CMPs).
However, usually at least some late enhancement at cardiac amyloidosis can be seen, and this patient was no exception. Late enhancement was seen ranging from smaller sub-endocardial and mid-myocardial patches to a transmural larger patch of LE in the basal part of the heart.
Additional findigs are pericardial and pleural effusions.