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Figure 1: (a) Muscle biopsy showing focus of lymphomononuclear infiltrates surrounding a regenerating myofiber (arrow head) resembling an inflammatory myopathy. v, vessel; m, myofiber. Hematoxylin and eosin x Obj.20. (b) Congo red stains show congophillic deposits around an endomyseal vessel (v) abutting the regenerating myofiber (arrow heads) that are brightly birefringent on cross-polarized light. Congo red cross-polarized light x Obj.10. (c and d) Similar congophillic deposits are also seen around an endomyseal vessel (c) (arrow) and in epimyseal collagen (arrow head) that exhibit apple-green birefringence on crosspolarized light (d). (c) Congo Red x Obj.20; (d) Congo red cross-polarized light x Obj.20

Figure 1: (a) Muscle biopsy showing focus of lymphomononuclear infiltrates surrounding a regenerating myofiber (arrow head) resembling an inflammatory myopathy. v, vessel; m, myofiber. Hematoxylin and eosin x Obj.20. (b) Congo red stains show congophillic deposits around an endomyseal vessel (v) abutting the regenerating myofiber (arrow heads) that are brightly birefringent on cross-polarized light. Congo red cross-polarized light x Obj.10. (c and d) Similar congophillic deposits are also seen around an endomyseal vessel (c) (arrow) and in epimyseal collagen (arrow head) that exhibit apple-green birefringence on crosspolarized light (d). (c) Congo Red x Obj.20; (d) Congo red cross-polarized light x Obj.20