What Is Bronchoscopy?

Bronchoscopy is a minimally invasive endoscopic procedure that provides direct visualization of the airways, from the larynx and trachea down through the bronchi to the sub-segmental level. A physician passes a bronchoscope, a thin instrument equipped with a light source, optical fiber bundle, and working channel, through the nose or mouth and into the lower respiratory tract. The procedure is used both to diagnose pulmonary disease and to perform a growing range of therapeutic interventions without open surgery.

The procedure was introduced into clinical practice in 1966 when Shigeto Ikeda developed the flexible fiberoptic bronchoscope, replacing the earlier rigid instruments that required general anesthesia and offered limited access beyond the central airways. Today bronchoscopy sits at the intersection of pulmonary medicine, biomedical instrumentation, and image-guided intervention, making it a topic of active research in minimally invasive medical technology.

Flexible and Rigid Bronchoscopy

Two instrument types remain in clinical use, each suited to a distinct set of indications. Flexible bronchoscopy, performed under moderate conscious sedation, allows access to peripheral airways that rigid scopes cannot reach and is the standard modality for diagnostic sampling and routine surveillance. The flexible bronchoscope includes a working channel through which biopsy forceps, brushes, and lavage catheters can be passed to collect tissue or fluid specimens. As described in the NIH StatPearls reference for bronchoscopy, the procedure carries a low complication rate, with pneumothorax occurring in approximately 1 to 3 percent of transbronchial biopsy cases.

Rigid bronchoscopy, performed under general anesthesia, provides a wider working channel capable of accommodating rigid instruments, suction catheters, and ventilation equipment simultaneously. It remains the preferred approach for massive hemoptysis, foreign body extraction, and the placement or maintenance of large-bore airway stents.

Diagnostic Applications

Bronchoscopy is the primary tool for direct airway assessment in patients presenting with hemoptysis, unexplained cough, stridor, or radiographically detected lung lesions. Bronchoalveolar lavage recovers cellular and microbiological material from the distal airways, enabling diagnosis of infections including Pneumocystis jirovecii pneumonia, as well as diffuse parenchymal lung diseases such as hypersensitivity pneumonitis.

Endobronchial ultrasound (EBUS), in which a miniaturized ultrasound transducer is integrated into the bronchoscope tip, extends diagnostic reach to mediastinal and hilar lymph nodes. The American Lung Association overview of endobronchial ultrasound explains how EBUS-guided needle aspiration has largely replaced mediastinoscopy for lymph node staging in lung cancer, reducing the need for a separate surgical procedure.

Therapeutic and Navigation-Guided Techniques

Beyond diagnosis, bronchoscopy supports a spectrum of therapeutic procedures in the central and peripheral airways. Laser ablation and argon plasma coagulation address endobronchial tumors obstructing ventilation; cryotherapy and electrocautery treat mucosal lesions and control bleeding. Airway stents, placed bronchoscopically, relieve malignant or benign stenoses and can be repositioned or removed if anatomy changes.

Electromagnetic navigation bronchoscopy (ENB) extends therapeutic capability to peripheral lung nodules that standard instruments cannot reach. ENB software generates a three-dimensional airway map from pre-procedural computed tomography images and provides real-time positional guidance during the procedure, allowing biopsy or fiducial marker placement at lesions as small as 10 mm. This image-guidance approach borrows principles from interventional radiology and robotic surgery, illustrating how bronchoscopy continues to evolve as platforms for image-guided pulmonary intervention as described by the American Cancer Society.

Applications

Bronchoscopy has applications in a range of clinical and research areas, including:

• Lung cancer staging and tissue biopsy for pathologic diagnosis
• Diagnosis and treatment of pulmonary infections in immunocompromised patients
• Foreign body removal from pediatric and adult airways
• Airway stenting for malignant or post-transplant stenosis
• Research in image-guided robotic bronchoscopy and ablation therapies