Fig. 2: Nonfibrotic hypersensitivity pneumonitis (HP).
From: Hypersensitivity pneumonitis: new concepts and classifications
A A case of nonfibrotic HP with a cellular nonspecific interstitial pneumonia (NSIP) pattern in a patient with farm exposure. Inset shows a granuloma. B Fibrotic HP. Fibrotic HP with purely bronchiolocentric fibrosis. Patient exposed to metal-working fluids. C Fibrotic HP. Higher power of Fig. 2B showing giant cells with cholesterol clefts (arrows). D Fibrotic HP. Patient with pet bird exposure. Note the peribronchiolar fibrosis in the upper part of the field and the subpleural fibrosis in the lower part.
