Tracheobronchopathia Osteochondroplastica: A Rare Cause of Chronic Cough

His general physical and systemic examination at presentation were unremarkable.His sputum examination was negative for acid-fast bacilli.His routine blood investigations were within normal limits.His chest radiograph was normal.Spirometry did not reveal any abnormality and showed no significant bronchodilator reversibility.Electrocardiogram and stress cardiac testing were normal, with no inducible ischemic changes.Highresolution computed tomography (HRCT) of thorax was done, which showed numerous calcified nodular opacities protruding from the anterior and lateral wall of the trachea with sparing of posterior membranous wall (Figs 1A to C).A flexible bronchoscopy done revealed diffuse mucosal nodularity of tracheobronchial wall up to the segmental level, with sparing of posterior membrane (Fig. 1D).Endobronchial biopsy was attempted, but could not be obtained due to gritty consistency of the nodular mucosa.A clinical diagnosis of TBO was made.He was counseled regarding the nature of his disease and treatment options in 1,