Periarteritis nodosa is a baffling disease. Many clinicians agree with Kussmaul and Maier1 that its prognosis too often is obvious long before its diagnosis can be established.
A voluminous literature describing periarteritis nodosa has accumulated since Kussmaul's day; so bulky a literature, in fact, that to report another case seems scarcely excusable. We have had occasion, however, to study a patient with periarteritis nodosa during twenty months of almost continuous hospitalization and (through many friends who saw her) to develop a record of her case which we believe gives a fairly complete account of the evolution of the disorder in this particular instance from early in its course until the end. The entire affair was peculiar enough to be interesting. Some of the observations made do not appear to have been reported in other cases on record. Finally, any light that can be shed on periarteritis nodosa may prove