Figure 2.
(A) Under light microscopy, rare degenerating cells (arrows) were present (H&E, ×200). (B) Mild perivascular mononuclear cell infiltration (arrow) was found (H&E, ×200). (C) Ultrastructurally, degenerating cells were scattered and exhibited rarefaction of myofilaments and Z-band streaming (uranyl acetate lead citrate, ×3,500). (D) The endothelial cells had a prominent tubuloreticular body (arrow) (uranyl acetate lead citrate, ×9,000). These findings are compatible with dermatomyositis.