Cryptogenic organising pneumonia or acute fibrinous and organising pneumonia?

First, histology is described as follows: ‘‘...diffuse intraalveolar exudate of granular, fibrinous material...’’. Organising pneumonia pattern, the histological hallmark of cryptogenic organising pneumonia, is characterised by intraalveolar buds of granulation tissue. Recently, a new anatomoclinical entity has been reported by BEASLEY et al. [2] as ‘‘acute fibrinous and organizing pneumonia (AFOP)’’. The clinical spectrum of this entity may be similar to cryptogenic organising pneumonia and, taking into account the morphological features on surgical lung biopsy specimens, in our opinion, the case reported by CHEE et al. [1] is more consistent with this diagnostic hypothesis.