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Hypersensitivity pneumonitis: a review and update of histologic findings
  1. Dianne Grunes,
  2. Mary Beth Beasley
  1. Department of Pathology, The Icahn School of Medicine of Mount Sinai School, New York, New York, USA
  1. Correspondence to Dr Mary Beth Beasley, Department of Pathology, Mount Sinai Medical Center, One Gustave L Levy Place, New York, NY 10029, USA; mbbeasleymd{at}


Hypersensitivity pneumonitis (HSP) is a poorly understood entity typically caused by exposure to an inciting antigen such as fungi, thermophilic bacteria or animal protein. Clinically, HSP is often divided into acute, subacute and chronic forms. While the subacute form is best described from a pathologic standpoint, the pathology of chronic HSP has only been critically evaluated in the past decade and the pathology of acute HSP is poorly described. The aim of this review is to summarise the current knowledge of pathogenetic theories of HSP and to review the current knowledge of the pathology of each stage of HSP and the main entities in the differential diagnosis.

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