Selective IgA deficiency associated with recurrent sinopulmonary infections in sarcoidosis.

We present a case of pulmonary sarcoidosis associated with serum and secretory IgA deficiency. This association has only previously been reported in 6 patients and may be coincidental. However, in light of current knowledge of the immunoregulatory defects postulated for sarcoidosis and for patients with selective IgA deficiency, 2 other possible explanations for the association of sarcoidosis and selective IgA deficiency are presented.