Table 2

Presence of fibrinoid necrosis and perivascular cellular infiltrates (PVI) in four spaced frozen sections of a muscle biopsy specimen as assessed in patients with rheumatoid vasculitis (RV), rheumatoid arthritis (RA), and primary osteoarthritis (OA)

RV (n=12)RA (n=14)OA (n=11)
Fibrinoid necrosis present4 (33)2-150 00
PVI present 9 (75) 2 (14)2 (18)
Median of (range)6 (0–4) 0 (0–2)0 (0–2)
PVI of one or two cell layers present1 (8)2 (14)2 (18)
PVI of ⩾3 cell layers present8 (67) 00
  • 2-150 Figures represent number of patients, percentages in parentheses (unless otherwise stated). RV v RA and OA; p< 0.05, χ2 test. RV v RA and OA; p< 0.05, Mann-Whitney U test. The results presented are those as scored at the first microscopic analysis of one observer in four frozen sections of one muscle sample. All RV patients had histological evidence of vasculitis in fixed muscle tissue.