PMC8905003_01
18F-fluorodeoxyglucose positron emission tomography.. 
18F-fluorodeoxyglucose positron emission tomography showed heterogeneous
18F-FDG uptake in left ventricle. Scale bar: 5cm.
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Cardiac 18F-FDG PET on day 67 demonstrated heterogeneous 18F-FDG uptake in the left ventricle with a maximum Standardized Uptake Value(SUV) of 3.97 ( Figure 1).
Electron microscopic investigation of endomyocardial biopsy.. Electron microscopy revealed mitochondrial myelinizations of the cristae in cardiomyocyte. Arrows indicate cardiomyocytes with the mitochondrial injury. Scale bar: 1 microm.
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Electron microscopic investigation of the endomyocardial biopsy, which was taken on day 75 to examine the cause of cardiac dysfunction, revealed abnormal findings in the mitochondria of the cardiomyocytes, including myelinization of the cristae ( Figure 2), which was interpreted as mitochondrial damage.