case_images: PMC9947569_01
case_images: Pyrophosphate (PYP) scan strongly suggestive of transthyretin cardiac amyloidosis (ATTR-CM)
case_images: cureus-0015-00000034121-i01.jpg
case_images: PMC9947569_01_cureus-0015-00000034121-i01.jpg
case_images: FIG1
case_images: A pyrophosphate (PYP) scan was obtained and strongly suggested transthyretin cardiac amyloidosis (ATTR-CM) (Figure 1).
case_images: Hematoxylin and eosin stain of the left vastus lateralis muscle: Moderate variability in muscle fiber size with active myofiber necrosis and myophagocytosis with minimal inflammatory infiltration
case_images: cureus-0015-00000034121-i02.jpg
case_images: PMC9947569_01_cureus-0015-00000034121-i02.jpg
case_images: FIG2
case_images: Left vastus lateralis muscle biopsy revealed moderate variability in muscle fiber size with active myofiber necrosis and myophagocytosis with minimal inflammatory infiltration on hematoxylin and eosin stain, significant for necrotizing myopathy (Figures 2, 3).
case_images: Hematoxylin and eosin stain of the left vastus lateralis muscle: Moderate variability in muscle fiber size with active myofiber necrosis and myophagocytosis with minimal inflammatory infiltration
case_images: cureus-0015-00000034121-i03.jpg
case_images: PMC9947569_01_cureus-0015-00000034121-i03.jpg
case_images: FIG3
case_images: Left vastus lateralis muscle biopsy revealed moderate variability in muscle fiber size with active myofiber necrosis and myophagocytosis with minimal inflammatory infiltration on hematoxylin and eosin stain, significant for necrotizing myopathy (Figures 2, 3).