Histological diversity of vasculitic lesions in MPO–ANCA‐positive autopsy cases
2001
To investigate the variety of histological features of vasculitic lesions in myeloperoxidase-specific antineutrophil cytoplasmic antibody (pANCA)-related vasculitis, retrospective pathological analysis was done on 13 autopsy cases, collected from 1990 to 1998 at five hospitals. These cases were classified into three groups: (i) pulmonary–renal syndrome characterized by capillaritis of lung and glomeruli with occasional small-vessel arteritis and/or phlebitis; (ii) glomerular capillaritis without pulmonary involvement associated with significant small-vessel arteritis; and (iii) extensive distribution of small-vessel arteritis with no capillary involvement. The results suggest that pANCA-related vasculitis encompasses a wide variety of vasculitic syndromes, including pulmonary–renal syndrome, microscopic polyarteritis nodosa, and classic polyarteritis nodosa. pANCA may contribute to pathogenesis in all of these cases.
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