- •Foreword
- •Preface
- •Contents
- •About the Editors
- •Contributors
- •1: Tracheobronchial Anatomy
- •Trachea
- •Introduction
- •External Morphology
- •Internal Morphology
- •Mucous Layer
- •Blood Supply
- •Anatomo-Clinical Relationships
- •Bronchi
- •Main Bronchi
- •Bronchial Division
- •Left Main Bronchus (LMB)
- •Right Main Bronchus (RMB)
- •Blood Supply
- •References
- •2: Flexible Bronchoscopy
- •Introduction
- •History
- •Description
- •Indications and Contraindications
- •Absolute Contraindications
- •Procedure Preparation
- •Technique of FB Procedure
- •Complications of FB Procedure
- •Basic Diagnostic Procedures
- •Bronchoalveolar Lavage (BAL)
- •Transbronchial Lung Biopsy (TBLB)
- •Transbronchial Needle Aspiration (TBNA)
- •Bronchial Brushings
- •Advanced Diagnostic Bronchoscopy
- •EBUS-TBNA
- •Ultrathin Bronchoscopy
- •Transbronchial Lung Cryobiobsy (TBLC)
- •Therapeutic Procedures Via FB
- •LASER Bronchoscopy
- •Electrocautery
- •Argon Plasma Coagulation (APC)
- •Cryotherapy
- •Photodynamic Therapy
- •Airway Stent Placement
- •Endobronchial Valve Placement
- •Conclusion
- •References
- •History and Historical Perspective
- •Indications and Contraindications
- •Procedure Description
- •Procedure Planning
- •Target Approximation
- •Sampling
- •Complications
- •Future Directions
- •Summary and Recommendations
- •References
- •4: Rigid Broncoscopy
- •Innovations
- •Ancillary Equipment
- •Rigid Bronchoscopy Applications
- •Laser Bronchoscopy
- •Tracheobronchial Prosthesis
- •Transbronchial Needle Aspiration (TBNA)
- •Rigid Bronchoscope in Other Treatments for Bronchial Obstruction
- •Mechanical Debridement
- •Pediatric Rigid Bronchoscopy
- •Tracheobronchial Dilatation
- •Foreign Bodies Removal
- •Other Indications
- •Complications
- •The Procedure
- •Some Conclusions
- •References
- •History and Historical Perspective
- •Indications and Contraindications
- •Preprocedural Evaluation and Preparation
- •Physical Examination
- •Procedure-Related Indications
- •Application of the Technique
- •Topical Anesthesia
- •Anesthesia of the Nasal Mucosa and Nasopharynx
- •Anesthesia of the Mouth and Oropharynx
- •Superior Laryngeal Nerve Block
- •Recurrent Laryngeal Nerve Block (RLN)
- •Conscious Sedation
- •Monitored Anesthesia Care (MAC)
- •General Anesthesia
- •Monitoring the Depth of Anesthesia
- •Interventional Bronchoscopy Suites
- •Airway Devices
- •Laryngeal Mask Airway (LMA)
- •Endotracheal Tube (ETT)
- •Rigid Bronchoscope
- •Modes of Ventilation
- •Spontaneous Ventilation
- •Assisted Ventilation
- •Noninvasive Positive Pressure Ventilation (NIV)
- •Positive Pressure Controlled Mechanical Ventilation
- •Jet Ventilation
- •Electronic Mechanical Jet Ventilation
- •Postprocedure Care
- •Special Consideration
- •Anesthesia for Peripheral Diagnostic and Therapeutic Bronchoscopy
- •Anesthesia for Interventional Bronchoscopic Procedures During the COVID-19 Pandemic
- •Summary and Recommendations
- •Conclusion
- •References
- •Background
- •Curricular Structure and Delivery
- •What Is a Bronchoscopy Curriculum?
- •Tradition, Teaching Styles, and Beliefs
- •Using Assessment Tools to Guide the Educational Process
- •The Ethics of Teaching
- •When Learners Teach: The Journey from Novice to Mastery and Back Again
- •The Future Is Now
- •References
- •Interventional Procedure
- •Assessment of Flow–Volume Curve
- •Dyspnea
- •Analysis of Pressure–Pressure Curve
- •Conclusions
- •References
- •Introduction
- •Adaptations of the IP Department
- •Environmental Control
- •Personal Protective Equipment
- •Procedure Performance
- •Bronchoscopy in Intubated Patients
- •Other Procedures in IP Unit
- •References
- •Introduction
- •Safety
- •Patient Safety
- •Provider Safety
- •Patient Selection and Screening
- •Lung Cancer Diagnosis and Staging
- •Inpatients
- •COVID-19 Clearance
- •COVID Clearance: A Role for Bronchoscopy
- •Long COVID: A Role for Bronchoscopy
- •Preparing for the Next Pandemic
- •References
- •Historical Perspective
- •Indications and Contraindications
- •Evidence-Based Review
- •Summary and Recommendations
- •References
- •Introduction
- •Clinical Presentation
- •Diagnosis
- •Treatment
- •History and Historical Perspectives
- •Indications and Contraindications
- •Benign and Malignant Tumors
- •Tumors with Uncertain Prognosis
- •Application of the Technique
- •Evidence Based Review
- •Summary and Recommendations
- •References
- •12: Cryotherapy and Cryospray
- •Introduction
- •Historical Perspective
- •Equipment
- •Cryoadhesion
- •Indications
- •Cryorecanalization
- •Cryoadhesion and Foreign Body Removal
- •Cryoadhesion and Mucus Plugs/Blood Clot Retrieval
- •Endobronchial Cryobiopsy
- •Transbronchial Cryobiopsy for Lung Cancer
- •Safety Concerns and Contraindications
- •Cryoablation
- •Indications
- •Evidence
- •Safety Concerns and Contraindications
- •Cryospray
- •Indications
- •Evidence
- •Safety Concerns and Contraindications
- •Advantages of Cryotherapy
- •Limitations
- •Future Research Directions
- •References
- •13: Brachytherapy
- •History and Historical Perspective
- •Indications and Contraindications
- •Application of the Technique
- •Evidence-Based Review
- •Adjuvant Treatment
- •Palliative Treatment
- •Complications
- •Summary and Recommendations
- •References
- •14: Photodynamic Therapy
- •Introduction
- •Photosensitizers
- •First-Generation Photosensitizers
- •M-Tetrahidroxofenil Cloro (mTHPC) (Foscan®)
- •PDT Reaction
- •Tumor Damage Process
- •Procedure
- •Indications
- •Curative PDT Indications
- •Palliative PDT Indications
- •Contraindications
- •Rationale for Use in Early-Stage Lung Cancer
- •Rationale
- •PDT in Combination with Other Techniques for Advanced-Stage Non-small Cell Lung Cancer
- •Commentary
- •Complementary Endoscopic Methods for PDT Applications
- •New Perspectives
- •Other PDT Applications
- •Conclusions
- •References
- •15: Benign Airways Stenosis
- •Etiology
- •Congenital Tracheal Stenosis
- •Iatrogenic
- •Infectious
- •Idiopathic Tracheal Stenosis
- •Distal Bronchial Stenosis
- •Diagnosis Methods
- •Patient History
- •Imaging Techniques
- •Bronchoscopy
- •Pulmonary Function Test
- •Treatment
- •Endoscopic Treatment
- •Dilatation
- •Laser Therapy
- •Stents
- •How to Proceed
- •Stent Placement
- •Placing a Montgomery T Tube
- •The Rule of Twos for Benign Tracheal Stenosis (Fig. 15.23)
- •Surgery
- •Summary and Recommendations
- •References
- •16: Endobronchial Prostheses
- •Introduction
- •Indications
- •Extrinsic Compression
- •Intraluminal Obstruction
- •Stump Fistulas
- •Esophago-respiratory Fistulas (ERF)
- •Expiratory Central Airway Collapse
- •Physiologic Rationale for Airway Stent Insertion
- •Stent Selection Criteria
- •Stent-Related Complications
- •Granulation Tissue
- •Stent Fracture
- •Migration
- •Contraindications
- •Follow-Up and Patient Education
- •References
- •Introduction
- •Overdiagnosis
- •False Positives
- •Radiation
- •Risk of Complications
- •Lung Cancer Screening Around the World
- •Incidental Lung Nodules
- •Management of Lung Nodules
- •References
- •Introduction
- •Minimally Invasive Procedures
- •Mediastinoscopy
- •CT-Guided Transthoracic Biopsy
- •Fluoroscopy-Guided Transthoracic Biopsies
- •US-Guided Transthoracic Biopsy
- •Thoracentesis and Pleural Biopsy
- •Thoracentesis
- •Pleural Biopsy
- •Surgical or Medical Thoracoscopy
- •Image-Guided Pleural Biopsy
- •Closed Pleural Biopsy
- •Image-Guided Biopsies for Extrathoracic Metastases
- •Tissue Acquisition, Handling and Processing
- •Implications of Tissue Acquisition
- •Guideline Recommendations for Tissue Acquisition in Mediastinal Staging
- •Methods to Overcome Challenges in Tissue Acquisition and Genotyping
- •Rapid on-Site Evaluation (ROSE)
- •Sensitive Genotyping Assays
- •Liquid Biopsy
- •Summary, Recommendations and Highlights
- •References
- •History
- •Data Source and Methodology
- •Tumor Size
- •Involvement of the Main Bronchus
- •Atelectasis/Pneumonitis
- •Nodal Staging
- •Proposal for the Revision of Stage Groupings
- •Small Cell Lung Cancer (SCLC)
- •Discussion
- •Methodology
- •T Descriptors
- •N Descriptors
- •M Descriptors
- •Summary
- •References
- •Introduction
- •Historical Perspective
- •Fluoroscopy
- •Radial EBUS Mini Probe (rEBUS)
- •Ultrasound Bronchoscope (EBUS)
- •Virtual Bronchoscopy
- •Trans-Parenchymal Access
- •Cone Beam CT (CBCT)
- •Lung Vision
- •Sampling Instruments
- •Conclusions
- •References
- •History and Historical Perspective
- •Narrow Band Imaging (NBI)
- •Dual Red Imaging (DRI)
- •Endobronchial Ultrasound (EBUS)
- •Optical Coherence Tomography (OCT)
- •Indications and Contraindications
- •Confocal Laser Endomicroscopy and Endocytoscopy
- •Raman Spectrophotometry
- •Application of the Technique
- •Supplemental Technology for Diagnostic Bronchoscopy
- •Evidence-Based Review
- •Summary and Recommendations, Highlight of the Developments During the Last Three Years (2013 on)
- •References
- •Introduction
- •History and Historical Perspective
- •Endoscopic AF-OCT System
- •Preclinical Studies
- •Clinical Studies
- •Lung Cancer
- •Asthma
- •Airway and Lumen Calibration
- •Obstructive Sleep Apnea
- •Future Applications
- •Summary
- •References
- •23: Endobronchial Ultrasound
- •History and Historical Perspective
- •Equipment
- •Technique
- •Indication, Application, and Evidence
- •Convex Probe Ultrasound
- •Equipment
- •Technique
- •Indication, Application, and Evidence
- •CP-EBUS for Malignant Mediastinal or Hilar Adenopathy
- •CP-EBUS for the Staging of Non-small Cell Lung Cancer
- •CP-EBUS for Restaging NSCLC After Neoadjuvant Chemotherapy
- •Complications
- •Summary
- •References
- •Introduction
- •What Is Electromagnetic Navigation?
- •SuperDimension Navigation System (EMN-SD)
- •Computerized Tomography
- •Computer Interphase
- •The Edge Catheter: Extended Working Channel (EWC)
- •Procedural Steps
- •Planning
- •Detecting Anatomical Landmarks
- •Pathway Planning
- •Saving the Plan and Exiting
- •Registration
- •Real-Time Navigation
- •SPiN System Veran Medical Technologies (EMN-VM)
- •Procedure
- •Planning
- •Navigation
- •Biopsy
- •Complications
- •Limitations
- •Summary
- •References
- •Introduction
- •Image Acquisition
- •Hardware
- •Practical Considerations
- •Radiation Dose
- •Mobile CT Studies
- •Future Directions
- •Conclusion
- •References
- •26: Robotic Assisted Bronchoscopy
- •Historical Perspective
- •Evidence-Based Review
- •Diagnostic Yield
- •Monarch RAB
- •Ion Endoluminal Robotic System
- •Summary
- •References
- •History and Historical Perspective
- •Indications and Contraindications
- •General
- •Application of the Technique
- •Preoperative Care
- •Patient’s Position and Operative Field
- •Incision and Initial Dissection
- •Palpation
- •Biopsy
- •Control of Haemostasis and Closure
- •Postoperative Care
- •Complications
- •Technical Variants
- •Extended Cervical Mediastinoscopy
- •Mediastinoscopic Biopsy of Scalene Lymph Nodes
- •Inferior Mediastinoscopy
- •Mediastino-Thoracoscopy
- •Video-Assisted Mediastinoscopic Lymphadenectomy
- •Transcervical Extended Mediastinal Lymphadenectomy
- •Evidence-Based Review
- •Summary and Recommendations
- •References
- •Introduction
- •Case 1
- •Adrenal and Hepatic Metastases
- •Brain
- •Bone
- •Case 1 Continued
- •Biomarkers
- •Case 1 Concluded
- •Case 2
- •Chest X-Ray
- •Computerized Tomography
- •Positive Emission Tomography
- •Magnetic Resonance Imaging
- •Endobronchial Ultrasound with Transbronchial Needle Aspiration
- •Transthoracic Needle Aspiration
- •Transbronchial Needle Aspiration
- •Endoscopic Ultrasound with Needle Aspiration
- •Combined EUS-FNA and EBUS-TBNA
- •Case 2 Concluded
- •Case 3
- •Standard Cervical Mediastinoscopy
- •Extended Cervical Mediastinoscopy
- •Anterior Mediastinoscopy
- •Video-Assisted Thoracic Surgery
- •Case 3 Concluded
- •Case 4
- •Summary
- •References
- •29: Pleural Anatomy
- •Pleural Embryonic Development
- •Pleural Histology
- •Cytological Characteristics
- •Mesothelial Cells Functions
- •Pleural Space Defense Mechanism
- •Pleura Macroscopic Anatomy
- •Visceral Pleura (Pleura Visceralis or Pulmonalis)
- •Parietal Pleura (Pleura Parietalis)
- •Costal Parietal Pleura (Costalis)
- •Pleural Cavity (Cavitas Thoracis)
- •Pleural Apex or Superior Pleural Sinus [12–15]
- •Anterior Costal-Phrenic Sinus or Cardio-Phrenic Sinus
- •Posterior Costal-Phrenic Sinus
- •Cost-Diaphragmatic Sinus or Lateral Cost-Phrenic Sinus
- •Fissures18
- •Pleural Vascularization
- •Parietal Pleura Lymphatic Drainage
- •Visceral Pleura Lymphatic Drainage
- •Pleural Innervation
- •References
- •30: Chest Ultrasound
- •Introduction
- •The Technique
- •The Normal Thorax
- •Chest Wall Pathology
- •Pleural Pathology
- •Pleural Thickening
- •Pneumothorax
- •Pulmonary Pathology
- •Extrathoracic Lymph Nodes
- •COVID and Chest Ultrasound
- •Conclusions
- •References
- •Introduction
- •History of Chest Tubes
- •Overview of Chest Tubes
- •Contraindications for Chest Tube Placement
- •Chest Tube Procedural Technique
- •Special Considerations
- •Pneumothorax
- •Empyema
- •Hemothorax
- •Chest Tube Size Considerations
- •Pleural Drainage Systems
- •History of and Introduction to Indwelling Pleural Catheters
- •Indications and Contraindications for IPC Placement
- •Special Considerations
- •Non-expandable Lung
- •Chylothorax
- •Pleurodesis
- •Follow-Up and IPC Removal
- •IPC-Related Complications and Management
- •Competency and Training
- •Summary
- •References
- •32: Empyema Thoracis
- •Historical Perspectives
- •Incidence
- •Epidemiology
- •Pathogenesis
- •Clinical Presentation
- •Radiologic Evaluation
- •Biochemical Analysis
- •Microbiology
- •Non-operative Management
- •Prognostication
- •Surgical Management
- •Survivorship
- •Summary and Recommendations
- •References
- •Evaluation
- •Initial Intervention
- •Pleural Interventions for Recurrent Symptomatic MPE
- •Especial Circumstances
- •References
- •34: Medical Thoracoscopy
- •Introduction
- •Diagnostic Indications for Medical Thoracoscopy
- •Lung Cancer
- •Mesothelioma
- •Other Tumors
- •Tuberculosis
- •Therapeutic Indications
- •Pleurodesis of Pneumothorax
- •Thoracoscopic Drainage
- •Drug Delivery
- •Procedural Safety and Contraindications
- •Equipment
- •Procedure
- •Pre-procedural Preparations and Considerations
- •Procedural Technique [32]
- •Medical Thoracoscopy Versus VATS
- •Conclusion
- •References
- •Historical Perspective
- •Indications and Contraindications
- •Evidence-Based Review
- •Endobronchial Valves
- •Airway Bypass Tracts
- •Coils
- •Other Methods of ELVR
- •Summary and Recommendations
- •References
- •36: Bronchial Thermoplasty
- •Introduction
- •Mechanism of Action
- •Trials
- •Long Term: Ten-Year Study
- •Patient Selection
- •Bronchial Thermoplasty Procedure
- •Equipment
- •Pre-procedure
- •Bronchoscopy
- •Post-procedure
- •Conclusion
- •References
- •Introduction
- •Bronchoalveolar Lavage (BAL)
- •Technical Aspects of BAL Procedure
- •ILD Cell Patterns and Diagnosis from BAL
- •Technical Advises for Conventional TLB and TLB-C in ILD
- •Future Directions
- •References
- •Introduction
- •The Pediatric Airway
- •Advanced Diagnostic Procedures
- •Endobronchial Ultrasound
- •Virtual Navigational Bronchoscopy
- •Cryobiopsy
- •Therapeutic Procedures
- •Dilation Procedures
- •Thermal Techniques
- •Mechanical Debridement
- •Endobronchial Airway Stents
- •Metallic Stents
- •Silastic Stents
- •Novel Stents
- •Endobronchial Valves
- •Bronchial Thermoplasty
- •Discussion
- •References
- •Introduction
- •Etiology
- •Congenital ADF
- •Malignant ADF
- •Cancer Treatment-Related ADF
- •Benign ADF
- •Iatrogenic ADF
- •Diagnosis
- •Treatment Options
- •Endoscopic Techniques
- •Stents
- •Clinical Results
- •Stent Complications
- •Other Available Stents
- •Other Endoscopic Methods
- •References
- •Introduction
- •Anatomy and Physiology of Swallowing
- •Functional Physiology of Swallowing
- •Epidemiology and Risk Factors
- •Types of Foreign Bodies
- •Organic
- •Inorganic
- •Mineral
- •Miscellaneous
- •Clinical Presentation
- •Acute FB
- •Retained FB
- •Radiologic Findings
- •Bronchoscopy
- •Airway Management
- •Rigid Vs. Flexible Bronchoscopy
- •Retrieval Procedure
- •Instruments
- •Grasping Forceps
- •Baskets
- •Balloons
- •Suction Instruments
- •Ablative Therapies
- •Cryotherapy
- •Laser Therapy
- •Electrocautery and APC
- •Surgical Management
- •Complications
- •Bleeding and Hemoptysis
- •Distal Airway Impaction
- •Iron Pill Aspiration
- •Follow-Up and Sequelae
- •Conclusion
- •References
- •Vascular Origin of Hemoptysis
- •History and Historical Perspective
- •Diagnostic Bronchoscopy
- •Therapeutic Bronchoscopy
- •General Measures
- •Therapeutic Bronchoscopy
- •Evidence-Based Review
- •Summary
- •Recommendations
- •References
- •History
- •“The Glottiscope” (1807)
- •“The Esophagoscope” (1895)
- •The Rigid Bronchoscope (1897–)
- •The Flexible Bronchoscope (1968–)
- •Transbronchial Lung Biopsy (1972) (Fig. 42.7)
- •Laser Therapy (1981–)
- •Endobronchial Stents (1990–)
- •Electromagnetic Navigation (2003–)
- •Bronchial Thermoplasty (2006–)
- •Endobronchial Microwave Therapy (2004–)
- •American Association for Bronchology and Interventional Pulmonology (AABIP) and Journal of Bronchology and Interventional Pulmonology (JOBIP) (1992–)
- •References
- •Index
39 Aero-Digestive Fistulas: Endoscopic Approach |
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Table 39.1 ADF algorithm (Modi ed from Bixby et al. [23])
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Diagnosis of ADF |
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General supportive measures: |
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Stop oral intake. |
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Initiate Enteral Feeding |
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Aspiration / reflux precautions |
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Treatment of underlaying conditions |
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Treatment of infectious complications |
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Malignant cause |
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Benign cause |
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Palliative Intent |
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Curative Intent |
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Surgical Candidate? |
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Surgical Candidate? |
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Yes |
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Case by case approach for available |
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Surgical Intervention |
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endoscopic treatments: stent |
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placement (esophageal, airway, |
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double stenting), other techniques |
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In stulas with a small ori ce, less than 3 mm, locally applied treatments can be tried and can be relatively safe and easy.
Endoscopic Techniques
Stents
There are two types of stents that we can consider to use for the treatment of ADF: silicone stents and self-expanding metallic stents (SEMS).
Silicone stents were rst invented and placed by J.F. Dumon for the treatment of benign and malignant tracheobronchial stenosis as well as ADF. They are available in different con gurations: straight and Y-shaped stents, with studs on the outer surface designed to avoid migration. In the case of the treatment of long aero-digestive
stulas, Dumon prostheses have the drawback that they can prevent complete closure of the s- tula if the studs further injure in the stulous tract; for this reason SEMS prostheses increasingly replaced Dumon prostheses in the airway for the treatment of ADF.
First generation of metallic stents, Gianturco stainless steel wire stents or Strecker stents, made of tantalum were early abandoned due to poor fexibility and adaptability, and high complication rate.
The so-called second generation of SEMS include the Wallstent—self-expandable with internal silicone-based covering with fared ends, made of a stainless steel alloy woven into a tubular mesh—and the Schneider prosthesis—a cobalt-based superalloy—both inserted using a fexible beroptic bronchoscope.
Subsequently, these prostheses were improved giving place to self-expanding metal stents, cov-
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A. N. Rodríguez and J. P. Díaz-Jiménez |
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ered with silicone (third generation) to avoid the important problems of the non-covered self- expanding metal prostheses (such as granulomatous or tumor growth through the metal mesh, generating obstructions and re-epithelialization of the mucosa involving the metallic wires that make extraction almost impossible).
Examples of third-generation airway stents are: Ultrafex Stent, made of nitinol (nickel–tita- nium alloy) uncovered or covered by silicone, Aero Stent made of nitinol and covered by polyurethane, and Micro-Tech Stent and Aerostent made of nitinol and completely covered by silicone. Also, the Bona Stent (made of nitinol and covered by silicone) and the NiTi Stent (made of nitinol and covered by polytetrafuoroethylene) are currently the most frequently chosen last- generation stents.
Nitinol alloys give the stent two important characteristics: pseudoelasticity effect, that is, an elastic response to an applied stress, and shape- memory effect, that is, maintaining a deformed shape at body temperature. These two effects are due to the thermodynamic and crystallographic structure of the elements conforming the stent.
Easy deployment and the ability to achieve better apposition to the airway mucosa are the two most important qualities of SEMS. These stents can be inserted and deployed with a ber-
optic bronchoscope and they are very adaptable to changes in both the direction and caliber of the airway. The advantage of these stents is that they adapt much better to the tracheal wall deformities, but also have the inconvenience of generating infammatory and granulomatous tissue growing in the mucosa. The lifespan of these stents is short, so metal fatigue and stent fracture can occur.
As we mentioned before, both silicone and self-expanding metal covered stents have been used for treatment or ADF (Figs. 39.4, 39.5, 39.6, and 39.7).
The rst approach to seal ADF should be esophageal stent [38]. Placement of the esophageal prosthesis is not dif cult, except when thestulae are located near the ends of the esophagus or there is an esophageal stenosis. In those cases, the procedure could be more complicated or sometimes impossible.
Self-expanding stents are more widely accepted for use in the esophagus since it manages to seal the stulous ori ce more ef ciently. However, there are two important drawbacks for those stents: one is due to their self-expanding property—if the size is not carefully selected, an oversized stent can stretch the lumen with its expansible radial forces, and can increase the s- tula due to excessive expansion of the esophageal
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Fig. 39.4 (a and b) Tracheoesophageal stula covered with a metallic stent
39 Aero-Digestive Fistulas: Endoscopic Approach |
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Fig. 39.5 (a, b, and c) Tracheal-mediastinal stula (right paratracheal) treated with metallic stent. Chest CT shows tumor in ltration with compromised tracheal rings
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Fig. 39.6 (a and b) Silicone Dumon Y-stent covering an ADF affecting the lower trachea and both mainstem bronchi. An additional stent was added within the right main bronchus for better coverage
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Fig. 39.7 (a and b) Silicone Dumon Y-stent covering an ADF resulting from radiotherapy
wall. There is also the additional risk of penetration through the airway wall. SEMS can also migrate more frequently than silicone stents since they have a smooth outer surface (36 Eliminar).
When silicone stents are chosen, we have to take into account that the studs (covering the external wall of Dumon stents) can prevent a good sealing and more than that, they can further
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