Figure 6b. CEP in a 59-year-old man with a 3-week history of severe cough and fever. The patient had 25% BAL fluid eosinophilia. (a) Thin-section (1-mm collimation) CT scan (lung windowing) shows ground-glass opacities with intralobular interstitial thickening in both lower lobes. (b) High-power photomicrograph (original magnification, x400; H-E stain) of a transbronchial lung biopsy specimen shows infiltration of eosinophils and polymorphous inflammatory cells into the alveolar lumen and interstitium and a varying degree of interstitial fibrosis (arrows).