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PubMed This is a summary of 13 peer-reviewed journal articles Updated
Otolaryngology

Seeing the Airway: How CTS is Diagnosed and Mapped

At a Glance

Congenital Tracheal Stenosis (CTS) is definitively diagnosed using a bronchoscopy to identify complete "O-shaped" cartilage rings inside the windpipe. Doctors combine this with 3D CT scans, 3D printing, and airflow simulations to precisely map the airway and plan corrective surgery.

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Diagnosing Congenital Tracheal Stenosis (CTS) requires a combination of high-tech imaging and direct visualization. Because the trachea is located deep within the chest, doctors use a specialized toolkit to see exactly where the narrowing is, how long it is, and how it relates to the heart [1][2].

The Definitive View: Bronchoscopy

A bronchoscopy is often considered the most critical tool for a definitive diagnosis [1]. During this procedure, an airway specialist (ENT) inserts a thin tube with a camera into your child’s windpipe while they are under anesthesia [3].

  • What they look for: The surgeon is searching for the tell-tale “O-shaped” complete rings. In a normal airway, they would see a soft, pulsing membrane at the back; in CTS, they see a rigid, continuous circle of cartilage [1].
  • Measuring the Gap: The doctor uses the scope to measure the exact diameter and length of the narrow section. This helps them determine if the stenosis is “short-segment” or “long-segment” [2].

Mapping the Structure: CT Scans

While a bronchoscopy shows the inside of the pipe, a CT scan (Computed Tomography) shows the outside and the surrounding area.

Modern CT scans use “3D reconstruction” to create a digital map of the chest [4]. This is essential for:

  • Checking the Heart: It identifies if blood vessels, like a pulmonary artery sling, are pressing on the airway from the outside [5].
  • Surgical Planning: It allows the surgeon to see exactly where the “O-rings” start and stop in relation to the heart and lungs [6].

Cutting-Edge Tools for Precision

In leading pediatric centers, surgeons are now using advanced technology to “test-run” the surgery before the first incision is made.

3D Printing

Using the data from a CT scan, hospitals can create a 3D-printed model of your child’s specific airway [7]. This life-sized, tangible model allows surgeons to:

  • Practice the slide tracheoplasty on a physical replica [8].
  • Show you, the parent, exactly where the problem is and how they plan to fix it [8][9].

Computational Fluid Dynamics (CFD)

CFD is a type of computer simulation originally used in aerospace engineering. In medicine, it is used to map how air flows through your child’s narrowed airway [10].

  • Measuring Resistance: CFD provides a quantitative “score” of how hard your child has to work to breathe [11].
  • Predicting Results: By simulating the surgery on a computer first, doctors can predict exactly how much easier breathing will become after the airway is widened [12][10].

These tools combined—the camera, the scan, the 3D model, and the simulation—ensure that the surgical team has a complete and personalized roadmap for your child’s care [7][13].

Next page: Classification and Outlook: Understanding Your Child’s Airway Map

Common questions in this guide

How is Congenital Tracheal Stenosis (CTS) diagnosed?
CTS is diagnosed using a combination of high-tech imaging and direct visualization. The most critical tools are a bronchoscopy to see inside the airway and a CT scan to map the outside structure and surrounding blood vessels.
What does a doctor look for during a bronchoscopy for CTS?
During a bronchoscopy, an airway specialist uses a camera to look for complete "O-shaped" cartilage rings that narrow the windpipe. They also measure the exact length and diameter of the narrowed section to plan treatment.
Why are CT scans needed if my child already had a bronchoscopy?
While a bronchoscopy shows the inside of the windpipe, a CT scan provides a 3D map of the outside. It is essential for checking if nearby blood vessels are pressing on the airway and helps surgeons plan exactly where to operate.
How are 3D-printed models used in CTS surgery?
Hospitals can use CT scan data to create a life-sized, 3D-printed replica of your child's airway. This allows surgeons to practice the operation beforehand and helps parents clearly visualize the narrowing and the surgical plan.
What is CFD (Computational Fluid Dynamics) in airway surgery?
CFD is a computer simulation that maps how air flows through your child's narrowed airway. It measures how hard your child has to work to breathe and helps doctors predict how much their breathing will improve after surgery.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Can you show me the images from the bronchoscopy that show the 'O-shaped' rings?
  2. 2.Will a 3D-printed model of my child's airway be used for preoperative planning or education?
  3. 3.What did the CT scan reveal about the relationship between the heart's blood vessels and the airway?
  4. 4.Is a CFD (Computational Fluid Dynamics) analysis available to help predict how breathing will improve after surgery?

Questions For You

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References

References (13)
  1. 1

    Diagnosis and management of complete tracheal rings with concurrent tracheoesophageal fistula.

    Wolter NE, Kennedy AA, Rutter MJ, et al.

    International journal of pediatric otorhinolaryngology 2020; (133()):109971 doi:10.1016/j.ijporl.2020.109971.

    PMID: 32179205
  2. 2

    Complete tracheal rings and hypoplastic left heart variant: a rare and fatal association.

    Bansal N, Mahadin DR, Aggarwal S

    Cardiology in the young 2019; (29(3)):445-447 doi:10.1017/S1047951118002391.

    PMID: 30698130
  3. 3

    [Ring-sling complex association with pig bronchus: a pediatric case report].

    Bergamini ML, Martínez Riccetti MC, Kiang JA, et al.

    Archivos argentinos de pediatria 2022; (120(3)):e133-e136 doi:10.5546/aap.2022.e133.

    PMID: 35533126
  4. 4

    [Associated vessel heteromorphosis in laparoscopic complete mesocolic excision and solutions to intraoperative hemorrhage].

    Jiao Y, He J, Li J, et al.

    Zhonghua wei chang wai ke za zhi = Chinese journal of gastrointestinal surgery 2018; (21(3)):259-266.

    PMID: 29577212
  5. 5

    The lingual-facial-ascending pharyngeal trunk.

    Triantafyllou G, Papadopoulos-Manolarakis P, Tudose RC, et al.

    Surgical and radiologic anatomy : SRA 2025; (47(1)):225 doi:10.1007/s00276-025-03721-w.

    PMID: 41060391
  6. 6

    A Preoperative Vascular Imaging Protocol for Planning of Supercharged Jejunal Conduits in Pediatric Esophageal Replacement.

    Rottgers SA, MacIsaac MF, Halsey JN, et al.

    Plastic and reconstructive surgery 2026; doi:10.1097/PRS.0000000000012969.

    PMID: 41739439
  7. 7

    Outcome of congenital tracheal stenosis in children over two decades in a national cardiothoracic surgical unit.

    McMahon CJ, Ayoubi K, Mehanna R, et al.

    Cardiology in the young 2020; (30(1)):34-38 doi:10.1017/S1047951119002725.

    PMID: 31744583
  8. 8

    Feasibility and potential of three-dimensional printing in laryngotracheal stenosis.

    Richard Z, Jackson E, Jung JP, Kanotra SP

    The Journal of laryngology and otology 2019; (133(6)):530-534 doi:10.1017/S0022215119001208.

    PMID: 31232244
  9. 9

    Three-dimensional printed model of bilateral Wilms tumor: A useful tool for planning nephron sparing surgery.

    Girón-Vallejo Ó, García-Calderón D, Ruiz-Pruneda R, et al.

    Pediatric blood & cancer 2018; (65(4)) doi:10.1002/pbc.26894.

    PMID: 29230948
  10. 10

    Computational fluid dynamics assessment of congenital tracheal stenosis.

    Morita K, Takeishi N, Wada S, Hatakeyama T

    Pediatric surgery international 2022; (38(12)):1769-1776 doi:10.1007/s00383-022-05228-6.

    PMID: 36104600
  11. 11

    Evaluation of the Tracheal Stenosis Effects on Airway Resistance and Work of Breathing Using Computational Fluid Dynamics.

    Monjezi M, Rismanian M, Kiani A, et al.

    Tanaffos 2023; (22(2)):209-214.

    PMID: 38628886
  12. 12

    Classification of tracheal stenosis in children based on computational aerodynamics.

    Poynot WJ, Gonthier KA, Dunham ME, Crosby TW

    Journal of biomechanics 2020; (104()):109752 doi:10.1016/j.jbiomech.2020.109752.

    PMID: 32224051
  13. 13

    Three-dimensional printed models as an effective tool for the management of complex congenital heart disease.

    Capellini K, Ait-Ali L, Pak V, et al.

    Frontiers in bioengineering and biotechnology 2024; (12()):1369514 doi:10.3389/fbioe.2024.1369514.

    PMID: 39157439

This page explains the diagnostic tools used for Congenital Tracheal Stenosis for educational purposes. Always consult your child's pediatric ENT or surgical team to understand their specific airway mapping and test results.

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