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In the paper "EULAR points to consider in the development of classification and diagnostic criteria in systemic vasculitis"  it is stated that microscopic polyangiitis (MPA) was described in 1948 . In fact, the first description of MPA I know of is considerably older than
that, dating back to 1923 .
 Basu N, Watts R, Bajema I et al. EULAR points to consi...
 Basu N, Watts R, Bajema I et al. EULAR points to consider in the development of classification and diagnostic criteria in systemic vasculitis. Ann Rheum Dis 2010;69:1744-1750.
 Davson J, Ball J, Platt R. The kidney in periarteritis nodosa. Q J Med 1948;17:175-202.
 Wohlwill F. Ueber die nur mikroskopisch erkennbare Form der Periarteritis nodosa [About the purely microscopic form of polyarteritis nodosa]. Virchows Arch Pathol Anat Physiol 1923;246:377-411.