Fibrotic hypersensitivity pneumonitis

Last revised by Joshua Yap on 31 Jan 2023

Fibrotic hypersensitivity pneumonitis (fHP) is a chronic, often progressive fibrosing form of hypersensitivity pneumonitis and is also often categorized as a form of interstitial lung disease. Manifestations previously categorized as chronic hypersensitivity pneumonitis now fall under this category. As with other forms of hypersensitivity pneumonitis it is caused by inhaled antigenic exposures. 

Radiographic features


The associated lung fibrosis can frequently demonstrate bronchocentricity 5

The collaborative American Thoracic Society (ATS), Japanese Respiratory Society (JRS), and Latin American Thoracic Association (ALAT) guidelines suggest using the three descriptors "typical", "compatible with", or "indeterminate for" fibrotic hypersensitivity pneumonitis 3:

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Cases and figures

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