ABSTRACT
Organizing pneumonia (OP) is an uncommon type of inflammatory and fibro-
proliferative disorder of the lung. Although its histological features were known
since the beginning of the 20th century, OP has been described only in the early
1980s by Davison et al. (1). Epler et al. used the term ‘‘bronchiolitis obliterans
with organizing pneumonia’’ (BOOP) to underline its frequent association with
bronchiolitis obliterans (2). Data accumulated over the next two decades to
further define and characterize this new syndrome (3-27) and culminated in its
recent classification among the idiopathic interstitial pneumonias (23).
