A female patient has suffered from Behcet's disease (BD) for 15 years.
During one recurrent episode proteinuria and microscopic hematuria we
re discovered. Renal biopsy revealed focal segmental glomerulopathy wi
th IgA deposits. Renal involvement in BD is uncommon and includes amyl
oidosis, crescentic glomerulonephritis and IgA nephropathy. BD is a ca
use of secondary IgA nephropathy. Immunologic features of the two dise
ases, particularly increased serum IgA, are reviewed.