Electron microscopy revealed necrosis and regeneration of capillary in which numerous microtubular inclusions appeared in their endothelial cells.

• 肌肉活检显示个别肌纤维坏死和萎缩，无炎细胞浸润和束周性肌萎缩，可见大量非特异性酯酶深染的小血管。