A patient with systemic lupus erythematosus (SLE) developed a rectal ulcer
and sepsis from colonic bacteria. At that time she had no other clinical ma
nifestations of SLE. Histopathologic examination of the biopsies taken from
the ulcer found evidence of vasculitis. Treatment with high-dose systemic
steroids healed the ulcer clinically and endoscopically, but symptoms recur
red when steroids were tapered. The patient was referred for surgery. This
is a rare but dangerous complication of SLE and can be the only clinical ma
nifestation of the disease.