PMC4558286_01
Muscle biopsy of left quadriceps. (a) Evidence of muscle fiber atrophy with abnormal variation in myofiber size. Note the absence of inflammatory infiltrates. (b) Regenerating muscle fibers (arrow). (c) Positive stain of membrane attack complex (arrow) in endomysial capillaries.
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Pathology showed abnormal variation in myofiber size (Fig. 1a) with pattern of degenerating and regenerating fibers (Fig. 1b). The membrane attack complex (C5b-9) was positive in endomysial capillaries in a speckled pattern (Fig. 1c).