Cap Myopathy

Gomori trichrome stain


H & E stain
Caps are dark regions (arrow) at the edge of muscle fibers stained with Gomori trichrome, H&E, VvG and Desmin

VvG stain

ATPase pH 9.4 stain
Caps do not stain on ATPase pH 9.4 or NADH.

NADH stain

Desmin: Present in caps

Desmin Immunocytochemistry

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