“…In 72-79% of the autopsy studies of patients with PAN, the kidneys are affected and changes of multiple infarctions, arterial aneurisms and glomerulonephritis are noted [2], Spontaneous kidney rupture with resultant perirenal hematoma is rare, but may be the initial presentation of this systemic disorder [3]. In a series of 130 cases of PAN seen at the Mayo Clinic, there were no spontaneous kidney ruptures or hematoma [4], Nearly 20 cases are documented in the English literature [3,[5][6][7][8][9]. We herein present 4 patients with spontaneous kidney rupture, 1 of whom had bilateral disease, and discuss the treatment.…”