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[Extrinsic allergic alveolitis: apropos of a case in a child].

We present a young male (12 years) with low grade fever, weight loose, anorexia and progressive dyspnea. The clinical, roentgenological and pulmonary function pictures are close with interstitial pneumonitis. The patient had a pigeon loft on his house, thus we tried confirmed the diagnosis of extrinsic allergic alveolitis: pigeon breeder's lung. We believed at any patient age the pigeon breeder's lung must be considered in the differential diagnosis of interstitial pneumonitis. A good anamnesis will avoid unnecessary complementary test.