Several syndromes involving antiphospholipid antibodies have been desc
ribed in the literature. Although the varied clinical manifestations h
ave been well delineated, the vascular pathophysiology in patients wit
h these antibodies remains unclear. Vascular damage is often described
as a vasculopathy; however, several case reports have described an as
sociated vasculitis. We report two patients with manifestations of ant
iphospholipid antibody syndrome (APLS) and concurrent vasculitis. The
first patient, a 42-year-old man, presented with abdominal pain and fe
vers. The second patient, a 39-year-old man, presented with fever and
testicular pain. Both were ultimately felt to have polyarteritis nodos
a associated with APLS. Their complicated hospital courses and difficu
lties we encountered in diagnosing and treating them are discussed. Th
e literature describing other cases of vasculitis associated with anti
phospholipid antibody syndrome is reviewed. Whether the presence of an
tiphospholipid antibodies favors the development of vasculitis or vice
versa is not clear. Further studies are needed to address this questi
on and to determine optimal therapeutic regimes in these critically il
l patients.