Fig. 2From: Tracheobronchopathia osteochondroplastica: clinical, bronchoscopic, and comorbid features in a case seriesHistopathological features of tracheobronchopathia osteochrondroplastica (bronchial biopsy). HES staining (hematoxylin-eosin saffron), magnification × 400. A Voluminous cartilaginous nodule (arrow) in the subepithelial stroma. B Two calcified nodules in the subepithelial stroma with one containing bone marrow tissue (arrow)Back to article page