Figure 4.

Imaging in chronic eosinophilic pneumonia. (A) Plain chest radiograph in a subject with chronic eosinophilic pneumonia showing peripheral air-space opacification in the mid and lower zones. (B) Chest HRCT scan of the same subject showing peripheral sub-pleural consolidation and ground glass changes with sparing of the central areas. This radiographic feature is typical for eosinophilic pneumonia. (C) Chest HRCT scan in a different subject showing consolidation encircling an area of ground glass opacification resembling a reversed halo (attol sign). This feature is seen in chronic eosinophilic pneumonia but also in a number of other pathologies including COP, sarcoidosis, vasculitis, and infection.