[Glomerulonephritis and sarcoidosis: study of a case].

A case of rapidly progressing glomerulonephritis accompanied by sarcoidosis is presented. The immunological pathogenesis of the underlying disease was shown by the positivity of the reactions for anti-IgA and anti-betal C/beta 1 A globulins and the presence of thick deposits in the mesexential matrix and some parts of the thickened basal membrane. Since generalised sarcoidosis is regarded as the expression of an immunological reaction to an unknown, diffuse antigen, this type of glomerulonephritis may be associated with the particular immunopathological condition observed in sarcoidosis.