Lesions

 intra-alveolar fibrin (alveolar fibrinous exudates)
 organizing pneumonia (pulmonary organization)
 type 2 pneumocyte hyperplasia
 edema
 acute inflammation and chronic inflammation (inflammatory infiltrate)
 pulmonary interstitial widening

Associations

 collagen vascular disease

• inflammatory myopathy
• juvenile dermatomyositis (#15689928#)

 amiodarone
 Haemophilus influenza
 Acinetobacter lymphomaairspray
 severe acute respiratory syndrome (SARS) (#15272286#)
 construction work
 coal mining
 zoological work

Differential diagnosis

 organizing pneumonia

References

 Beasley MB, Franks TJ, Galvin JR, Gochuico B, Travis WD. Acute fibrinous and organizing pneumonia: a histological pattern of lung injury and possible variant of diffuse alveolar damage. Arch Pathol Lab Med. 2002 Sep;126(9):1064-70. PMID: #12204055#