Diagnostic imaging enabled the surgeon for the visual evaluation of normal and abnormal anatomy of the region and thus helped in accurate diagnosis of many diseases. Tracheobronchoscopy was found more feasible and advantageous in diagnosis of respiratory disease as compared with that of physical examination, haematology and radiography and allows descriptive or photographic documentation of findings. | Endoscopic study of normal trachea and bronchus through tracheobronchoscope in 60 healthy dogs