Forme emphysémateuse de la maladie du poumon de fermier

The current classification of HP differentiates acute, subacute and chronic forms but does not take account of the role of the mode of exposure and the evolution of the disease. The prognosis and evolution of HP seem to be dependent on the type and pattern of exposure. A new classification with two clusters has been suggested: in type 1, massive and intermittent exposure, as in FL, may lead to emphysema with chronic airflow obstruction and, in type 2, chronic exposure to a low level, as in bird fanciers, may lead to fibrosis with a restrictive pattern.