Fig. 4From: Intestinal Behçet’s disease complicated by myelodysplastic syndrome and secondary pulmonary alveolar proteinosis: a case reportHistopathology with periodic acid–Schiff staining obtained by transbronchial lung biopsy. The slide showed alveoli filled with an amorphous and acellular eosinophilic material, indicating the presence of pulmonary alveolar proteinosis (magnification, 200 ×)Back to article page