Traction Bronchiectasis: Causes, Symptoms, and Treatment Options

Traction bronchiectasis is the permanent and irreversible widening of the bronchi caused by the hardening and contraction of the lung parenchyma surrounding the airways as a result of fibrosis. Developing secondary to progressive interstitial lung diseases, this condition presents with symptoms such as persistent chronic cough, purulent sputum production, and shortness of breath that worsens with exertion. Connective tissue diseases, previous tuberculosis, or tissue destruction associated with environmental factors are among the main causes of this disease. In diagnosed patients, the treatment approach is successfully shaped through a combination of comprehensive clinical methods such as management of the underlying tissue damage, minimally invasive resection techniques in thoracic surgery, and bilateral lung transplantation in advanced-stage cases.

What is traction bronchiectasis and what kind of change does it create in our lungs?

The internal structure of the lung consists of microscopic air sacs where the air we breathe meets the blood vessels and the supporting tissues surrounding them. This supporting tissue, medically called the interstitium, is a kind of skeleton of the lung. Traction bronchiectasis is not a direct intrinsic disease of the airways themselves but rather a secondary result of events occurring in this supporting tissue. To understand the mechanism by which the disease develops, it may be useful to consider the scar tissue (fibrosis) that forms in the lung. Just as tissue contracts and pulls the surrounding skin while a deep wound heals anywhere in the body, hardened tissues within the lung show a similar tendency to contract. This contraction strongly pulls the surrounding small airways outward. This pulling force is medically called traction.

This continuous outward pulling may cause the muscle and cartilage structures in the airway walls to weaken over time, lose their elasticity, and become permanently widened. These enlarged airways largely lose their ability to clean themselves. While microscopic hairs in a healthy lung sweep sputum and foreign substances upward for removal, secretions begin to accumulate in these structurally damaged and enlarged areas. These retained fluids create a highly favorable environment for bacteria to settle. The body’s defense system, particularly cells called neutrophils, rushes intensely into the lungs to fight the bacteria in this region. However, some powerful enzymes released during this cellular defense may damage not only the bacteria but also the patient’s own lung tissue. This creates a self-perpetuating cycle that progresses through inflammation, tissue damage, further hardening, and consequently greater airway widening.

What are the main causes that predispose to the development of traction bronchiectasis?

The development of this condition is usually driven by other underlying diseases that diffusely affect the spongy structure of the lung and cause the tissue to harden. Idiopathic pulmonary fibrosis, which has no known cause and is characterized by progressive hardening of the lungs, is considered one of the most common predisposing factors. In this disease, the lung tissue gradually transforms into a hard, scar-like structure and mechanically pulls on the surrounding airways.

Another important group of factors includes systemic rheumatological diseases in which the immune system mistakenly attacks the body’s own healthy cells. Connective tissue diseases such as rheumatoid arthritis, scleroderma, or advanced-stage sarcoidosis may target not only the joints or skin but also the lungs. This autoimmune inflammation beginning in the lung tissue is gradually replaced by hardened tissue, which may trigger traction-related bronchial widening.

Damage left behind by severe lung infections experienced in previous years may also create a significant predisposition. In particular, destructive diseases such as tuberculosis may leave deep scars, usually in the upper parts of the lungs, even after they have healed. As these scars contract, they may cause structural deterioration in the airways. In addition, inhaled harmful chemicals, long-term cigarette use, or prolonged occupational exposure to inorganic dusts such as asbestos or silica may damage the natural structure of the lungs and contribute to the development of these traction forces over the years.

How are the types of traction bronchiectasis developing in the lungs structurally classified?

Depending on the rate of disease progression and the extent of destruction in the lung tissue, different physical deformities may be observed in the airways. Classification according to the shape of the airways on radiological images generally guides clinicians in understanding how far the process has progressed. The main forms defined according to the extent of structural deterioration are:

• Cylindrical form
• Varicose form
• Saccular form

The cylindrical form may be considered the first and relatively milder stage in which the airways begin to be affected by external pulling forces. Under normal conditions, the airways should gradually narrow and become thinner like tree branches as they progress toward the outer parts of the lung. In the cylindrical form, however, this tapering disappears and the airways continue extending with the same thickness in the shape of a tube or pipe. The hardening in the surrounding tissue has not yet dramatically distorted the shape of the bronchus, but loss of elasticity has begun.

The varicose form may indicate that the disease has progressed somewhat further. Because the pulling forces on the airways become irregular, the cartilage and muscle support of the bronchial wall collapses in some areas while continuing to widen in others. On radiological images, this appears as an irregular structure with alternating constrictions and dilatations, resembling varicose veins in the legs.

The saccular form is used to describe cases in which the airway structure is severely damaged. The bronchi completely lose their tube-like structure and become ballooned, enlarged sacs resembling clusters of grapes. These sacs, which have largely lost their function, tend to fill with sputum and inflammatory fluids that cannot be cleared, creating a significant basis for the persistence of chronic infections.

What are the symptoms of traction bronchiectasis encountered by patients in daily life?

The deterioration of the basic anatomy of the lung and the failure of its self-cleaning mechanism may lead to a range of symptoms that profoundly affect patients’ daily lives and exercise capacity. The body makes an intense effort to remove inflammatory secretions that accumulate in the airways and cannot be expelled through normal mechanisms. Difficulties in transferring oxygen into the bloodstream due to hardening of the lungs also directly reduce the patient’s exercise tolerance. The main complaints that may be reflected in the clinical presentation during this process can be listed as follows:

• Persistent and generally productive cough
• Production of thick yellow or green secretions
• Progressively worsening shortness of breath
• Enlargement of the fingertips and toes (clubbing)
• Unexplained weight loss and fatigue
• Frequently recurring lower respiratory tract infections
• Fine sounds coming from the chest during breathing

Shortness of breath in particular may initially be felt only while climbing stairs or walking quickly, but as the hardening of the lung tissue and airway damage progress, it may become severe enough to disturb the person even at rest. Chronically low levels of oxygen circulating in the blood may eventually cause the soft tissues at the fingertips to enlarge and the nail beds to become rounded. In addition, during the physician’s examination, certain high-frequency respiratory sounds heard with a stethoscope, particularly toward the end of inhalation and believed to result from tissue tension, may be among the findings supporting the diagnosis. The body’s constant struggle against inflammation may also exhaust the metabolism and lead to systemic effects such as fatigue and weight loss in the long term.

How is traction bronchiectasis diagnosed using medical imaging methods?

Although physical examination and clinical history provide highly valuable information when evaluating patients presenting with respiratory distress and persistent cough, the internal structure of the lungs must be visualized in great detail to make a definitive assessment. Today, one of the most detailed and guiding methods used for this purpose is High-Resolution Computed Tomography. These modern scans, which have replaced older contrast-enhanced methods that were quite challenging for patients, map changes in the lungs almost at the microscopic level.

During radiological assessment, clinicians carefully examine certain anatomical ratios. In normal anatomy, the diameter of an airway (bronchus) and the diameter of the artery running immediately beside it are quite similar. However, in traction bronchiectasis, the airways widen far beyond normal due to external pulling forces, causing this ratio to become markedly distorted in favor of the airway. When the airway diameter exceeds the vessel diameter by more than one and a half times, this may be considered significant dilatation.

In addition, in a normal lung, the airways become so thin as they approach the outermost membranes (the pleura) that they are almost impossible to see on CT. However, the strong tension created by the traction mechanism makes these airways visible as thick tubes even at the outermost borders of the lungs. The presence of web-like structures resembling scars and small honeycomb-like holes in the surrounding tissue is also considered among the strongest visual evidence of the underlying hardening (fibrosis).

Why are surgical approaches important for traction bronchiectasis during the diagnostic process?

Although radiological images clearly reveal the deterioration in the airways, it may not always be possible to determine the exact underlying disease causing the hardening (fibrosis) in the lungs by examining CT images alone. The molecular structure and cellular origin of each type of lung fibrosis, and therefore the medication to be administered, may differ. To make this distinction as accurately as possible and clarify the diagnosis at the cellular level, it may often be necessary to obtain a tissue sample from the affected area.

Specimens obtained through standard bronchoscopy procedures performed through the mouth or nose may generally be too small or may not provide the expected clear results during pathological examination because the tissue can be crushed during the procedure. At this stage, thoracic surgical techniques may be used to establish the cellular diagnosis with the lowest possible margin of error. Lung biopsies performed using minimally invasive surgical methods allow sufficiently large and structurally intact specimens to be obtained from the areas where the diseased tissue is most concentrated. These ideal samples provide pathologists with a major advantage in determining the type of disease and may form the basis for planning the medical treatment that the patient will use for years in the most accurate way.

What preparations are made for traction bronchiectasis patients before surgery?

If surgery is decided upon, the success of thoracic surgical resections largely depends on a meticulously conducted preoperative preparation process. Because removing part or all of the lung tissue creates a major change in the body, the patient’s respiratory capacity, cardiac health, and overall resilience are evaluated in detail by a multidisciplinary council. The main preparatory steps applied during this sensitive process to minimize operative risk and support recovery include:

• Measurement of lung volume with pulmonary function tests
• Assessment of carbon monoxide diffusion capacity (DLCO)
• Cardiological exercise and rhythm evaluations
• Identification of the type of infection through sputum culture analysis
• Targeted and multiple antibiotic treatment
• Airway evaluation through bronchoscopic examination

Among these preparations, infection control is particularly critical. Aggressive antibiotic regimens may be initiated weeks before the operation to prevent bacteria residing in the enlarged airways from spreading during or after surgery. Immediately before the operation, the patient’s airways may also be examined with a lighted camera system (bronchoscopy) to ensure that no dense secretions or plugs are present that could complicate the procedure.

In which situations does surgical intervention become a strong necessity for traction bronchiectasis?

Because traction bronchiectasis is generally part of a systemic process that diffusely affects the lungs, surgery may not be the first treatment option for every patient. However, certain specific complications developing during the course of the disease may make quality of life intolerable or create directly life-threatening emergencies. In such situations, surgical intervention options may be prioritized.

The most common reason for considering surgery is the failure of patients to recover despite extensive medication, intensive physiotherapy, and repeated courses of antibiotics. If the damaged area of the lung has become a continuous source of microorganisms and no longer allows the patient to lead a normal life, removing the diseased tissue from the body may become a strong option.

Another more urgent and life-threatening condition is massive bleeding (hemoptysis). Over time, new blood vessels with higher-than-normal pressure may develop around the enlarged and inflamed airways. Severe coughing attacks or erosion of the vessel wall by infection may cause these vessels to rupture suddenly and fill the airways with blood. Because this condition may create a risk of suffocation, rapid surgical removal of the diseased region may be adopted as a life-saving approach when severe bleeding cannot be controlled by medical methods.

Which modern methods are currently used in thoracic surgery for the treatment of traction bronchiectasis?

When removal of the diseased lung tissue is decided upon, the main procedure performed is called “resection.” In the past, such major operations were carried out through open thoracotomy methods involving large incisions in the chest and separation of the ribs. Today, however, minimally invasive methods have become predominant due to the integration of technology into medicine. The aim is always to remove the damaged lobe or segment serving as the source of infection completely and without leaving diseased tissue behind.

Methods known as Video-Assisted Thoracoscopic Surgery (VATS) allow the procedure to be performed by inserting a camera and long, thin instruments through small incisions made between the ribs. In recent years, procedures performed through only one small incision (uniportal VATS) have reduced surgical trauma to very low levels. Avoiding muscle division and rib spreading may significantly reduce the mechanical pain the patient experiences while breathing.

Another advanced technology, Robotic-Assisted Thoracic Surgery (RATS), may greatly facilitate the surgeon’s work, particularly in complex cases involving numerous adhesions and distorted anatomical structures caused by the disease. Highly mobile robotic arms controlled by the surgeon from a console may allow even the finest tissue planes to be safely separated under three-dimensional, high-resolution visualization. Compared with open surgery, these modern approaches generally aim to reduce complication rates and shorten the patient’s discharge time.

How is the recovery process of traction bronchiectasis managed after surgery?

Although resection procedures have become safer with modern methods, recovery after lung surgery remains a sensitive process requiring close cooperation between the patient and the healthcare team. The primary goal after surgery is to enable the lung to expand as quickly as possible and prevent secretions from accumulating in the remaining tissue and causing a new infection. Supportive methods applied during the early postoperative period for this purpose include:

• Intensive respiratory physiotherapy
• Early mobilization in and out of bed
• Deep breathing exercises using Triflow (a respiratory exercise device)
• Monitoring and care of vacuum-assisted chest tubes
• Effective surgical wound pain management
• Provision of adequate hydration (fluid support)

The lung on the operated side may not be ventilated at full capacity because of shallow breathing associated with pain. To prevent this, patients are taught effective coughing techniques. Chest tubes inserted to remove internal fluid and leaking air are closely monitored until the fluid and air leakage stop, and they may be removed painlessly once the condition becomes stable. Regular physiotherapy can significantly support most patients in beginning to adapt to normal life within a few days after surgery.

How does the lung transplantation process work in advanced-stage traction bronchiectasis?

Unfortunately, regional surgical interventions such as resection may not be possible when the disease affects not only a localized area but also a large portion of both lungs and tissue hardening has reached the final stage. This is because removing the diseased areas may leave insufficient healthy lung tissue to provide the respiratory capacity needed for the patient to survive or exert themselves. In such situations, the most advanced approach medicine can offer is lung transplantation.

Patients may be evaluated for organ transplantation waiting lists particularly when vital capacity falls below critical levels on pulmonary function tests and the patient no longer responds even to home oxygen devices. For these patients, replacing both lungs (bilateral lung transplantation) may generally be preferred. Although lung transplantation is a highly demanding journey that requires lifelong use of immunosuppressive medications, it is generally considered a promising option that may restore the freedom to breathe for suitable candidates experiencing end-stage respiratory failure.

What supportive approaches can be used to manage traction bronchiectasis apart from surgery?

A large proportion of patients may not be suitable candidates for surgical procedures, or long-term supportive treatments may be required before surgery is planned due to the course of the disease. Anti-fibrotic molecules developed specifically to stop or slow the hardening of lung tissue may greatly help slow the rapid progression of the disease by suppressing scar formation mechanisms at the cellular level. In addition to medications, other methods used to improve patients’ overall physical condition and help them cope with the sensation of shortness of breath include:

• Use of anti-fibrotic medications
• Reflux treatments that suppress gastric acid
• Continuous oxygen support with home oxygen devices
• Pulmonary rehabilitation programs
• Special respiratory muscle-strengthening exercises
• Nutrition programs supporting the immune system

Pulmonary rehabilitation is a highly valuable combination of education and exercise that not only increases patients’ physical capacity but also teaches them how to maximize breathing efficiency when the lungs become restricted. At the same time, gastric protective treatments used to prevent stomach acid from passing from the esophagus into the airways (reflux), which may trigger lung fibrosis, can also contribute greatly to limiting lung damage. Although all these multidimensional approaches may not eliminate the disease in a single step, they aim to increase patients’ participation in daily life and keep respiratory difficulties at a manageable level. Early awareness and regular physician follow-up are the fundamental keys to managing the process as safely as possible.

Frequently asked questions

Prof. Dr. Alper Fındıkçıoğlu

Prof. Dr. Alper Fındıkcıoğlu graduated from Istanbul University Faculty of Medicine and completed his thoracic surgery residency at Dr. Siyami Ersek Hospital. He began his academic career at Başkent University in 2005; he received the title of associate professor in 2014 and professor in 2022. He has extensive experience in lung cancer, chest wall diseases, and minimally invasive surgery. Since 2024, he has been continuing his professional work at Acıbadem Hospital.