[Extrinsic allergic alveolitis and hematologic diseases (lymphoproliferative syndromes)]

The authors report 2 cases of hypersensitivity pneumopathy associated with haematological abnormalities: benign lymphoproliferative syndrome in one case, and malignant lymphadenopathy with fatal outcome in the other case. Such cases, now observed with increasing frequency, can be regarded either as chance associations of 2 types of disease, or as the results of immune disorders with repercussions on the blood.