Stenosis

Stenosis is a narrowing of a duct or opening in the body that prevents its proper functioning. It can occur in the spinal column, blood vessels, heart valves, esophagus, or urethra.

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Symptoms and Causes

Stenosis is the pathological narrowing of a duct, blood vessel, or body opening, reducing flow or functional space. It may be congenital or acquired as a consequence of disease, a congenital malformation, or a medical procedure.

There are different types of stenosis depending on the affected organ:

  • Spinal stenosis: narrowing of the spinal canal through which the spinal cord and spinal nerve roots pass; it is also known as canal stenosis.
    • Lumbar canal stenosis: affects the lower part of the spine, between vertebrae L1 and L5.
    • Thoracic canal stenosis: occurs in the mid-back region, between vertebrae T1 and T12.
    • Cervical canal stenosis: occurs in the cervical region of the neck, between vertebrae C1 and C7.
    • Foraminal or neuroforaminal stenosis: narrowing of the intervertebral foramina, which are the openings between vertebrae, reducing space for nerve roots.
  • Valvular stenosis: condition in which one of the heart valves becomes narrowed.
    • Aortic stenosis: occurs in the valve between the left ventricle and the aorta.
    • Mitral stenosis: affects the valve between the left atrium and the left ventricle.
    • Tricuspid stenosis: affects the valve separating the right atrium from the right ventricle.
    • Pulmonary stenosis: rare condition affecting the valve between the right ventricle and the pulmonary artery. It is usually congenital.
  • Vascular stenosis: narrowing of a blood vessel.
    • Carotid stenosis: affects the carotid arteries, located on both sides of the neck, which supply oxygen to the head and brain.
    • Renal stenosis: occurs in the renal arteries that supply blood to the kidneys.
    • Peripheral stenosis: occurs in the vessels supplying the limbs.
  • Urethral stenosis: occurs in the duct that connects the bladder to the outside (urethra).
  • Esophageal stenosis: narrowing of the esophagus, the tube connecting the pharynx to the stomach.

The prognosis of stenosis depends on its location and severity. Although it is a treatable condition, it is often degenerative, making early detection essential. In general, vascular stenosis is the most severe and has higher mortality rates. The other types usually have a good prognosis regardless of treatment required.

Symptoms

Symptoms of stenosis vary significantly depending on the affected organ. The most characteristic are:

  • Spinal stenosis: although in some cases it is asymptomatic, especially in early stages, it may progressively present:
    • Back pain that improves when sitting or leaning forward.
    • Neck pain.
    • Leg cramps, especially when walking or standing for long periods.
    • Neck numbness.
    • Weakness and tingling in the arms or legs, which may impair walking or gripping objects.
    • Alterations in bowel or bladder function, which may lead to loss of control over these functions.
  • Valvular stenosis:
    • Fatigue.
    • Shortness of breath, initially on exertion, progressing to minimal exertion or even at rest.
    • Chest pain on exertion.
    • Dizziness, lightheadedness.
    • Palpitations.
    • Fainting.
    • Irregular heartbeat.
    • Edema in ankles or feet.
  • Vascular stenosis: symptoms vary depending on the vessel involved:
    • Carotid stenosis: initially asymptomatic, later presenting:
      • Dizziness, syncope.
      • Blurred visión.
      • Loss of vision in one eye.
      • Facial numbness.
      • Speech difficulties.
    • Renal stenosis: usually asymptomatic until advanced stages:
      • Hypertension.
      • Vascular bruit (blood flow produces sound when passing through the damaged vessel).
      • Edema (fluid accumulation in legs, ankles, or feet).
      • Inflammation.
    • Peripheral stenosis:
      • Pain.
      • Cramps in arms or legs.
      • Muscle weakness, heaviness.
      • Coldness and numbness in feet and toes.
      • Skin changes in the limbs: thinner, tight, shiny, color changes.
      • Weak or absent pulse in legs and feet.
  • Urethral stenosis:
    • Weak urinary flow or spray-like stream.
    • Inability to fully empty the bladder.
    • Straining to initiate urination.
    • Pain or burning during urination.
    • Increased urinary frequency.
    • Recurrent urinary tract infections.
  • Esophageal stenosis:
    • Dysphagia: difficulty swallowing. Initially solids, later also liquids in advanced stages.
    • Pain when swallowing food.
    • Regurgitation of solid or liquid food from the esophagus to the mouth.
    • Weight loss.

Causes

The most common causes of stenosis are:

  • Spinal stenosis:
    • Congenital defect: narrower spinal canal from birth.
    • Arthritis: degenerative disease causing inflammation of joints, including vertebral joints.
    • Herniated disc: displacement of the gelatinous nucleus of an intervertebral disc through a tear in the annulus fibrosus.
    • Ligament stiffness.
    • Trauma.
  • Valvular stenosis:
    • Congenital heart defect.
    • Valve calcification: calcium accumulation that progressively narrows the valve opening.
    • Rheumatic fever: scarring of the aortic valve due to complicated streptococcal tonsillitis.
    • Infective endocarditis: bacterial infection causing inflammation of the heart lining and leaving scars that damage valve structure.
  • Vascular stenosis:
    • Atherosclerosis: plaque buildup (cholesterol, fat, calcium) in arterial walls.
    • Fibromuscular dysplasia: abnormal growth of the arterial wall muscle leading to narrowing.
  • Urethral stenosis: scar tissue formation in the urethra due to:
    • Medical procedures involving instrumentation through the urethra (endoscope, catheter).
    • Pelvic trauma.
    • Benign prostatic hyperplasia.
    • Sexually transmitted infections.
    • Urethral or prostate cancer.
    • Lichen sclerosus: chronic inflammatory disorder causing white patches on the penis, skin thickening, blisters after sexual intercourse, loss of elasticity, rigidity of the frenulum, and urethral narrowing.
    • Radiotherapy in the area.
  • Esophageal stenosis:
    • Gastroesophageal reflux disease: gastric contents rise into the esophagus due to malfunction of the lower esophageal sphincter.
    • Barrett’s esophagus: complication of GERD causing precancerous cellular changes.
    • Esophageal cancer.
    • Eosinophilic esophagitis: chronic immune disorder causing inflammation and eosinophil accumulation in the esophagus.
    • Prolonged nasogastric tube use.
    • Ingestion of corrosive substances (bleach or acids).
    • Previous esophageal surgery.

Risk Factors

Risk of stenosis increases significantly in the following cases:

  • Spinal stenosis:
    • Age over 50.
    • Scoliosis.
    • Dwarfism.
    • Trauma.
    • Lifestyle: heavy lifting, poor posture, obesity.
  • Valvular stenosis:
    • Age over 65.
    • Atherosclerosis.
    • Chronic kidney disease (associated with calcifications).
    • Radiotherapy.
  • Vascular stenosis:
    • Age over 65; incidence increases significantly after 75.
    • Smoking.
    • Hypertension.
    • Hypercholesterolemia.
    • Diabetes mellitus (increases arterial stiffening risk).
    • Obesity.
    • Sedentary lifestyle.
    • Family history.
  • Urethral stenosis:
    • Male sex.
    • Age over 55.
    • Sexually transmitted infections damaging urethral tissue.
    • Congenital anomalies.
    • Prolonged urethral catheterization.
  • Esophageal stenosis:
    • Certain medications (e.g., aspirin or antibiotics) without sufficient water, causing esophagitis.
    • Scleroderma: autoimmune disease causing skin hardening and, in some cases, esophageal muscle fibrosis or atrophy.
    • Schatzki rings: concentric mucosal folds causing narrowing at the esophagogastric junction.

Complications

Stenosis may cause complications that impair quality of life and, in severe cases, endanger health:

  • Spinal stenosis:
    • Chronic pain.
    • Loss of limb sensation.
    • Mobility impairment.
    • Loss of balance.
    • Urinary or fecal incontinence.
    • Paralysis.
  • Valvular stenosis:
    • Heart failure.
    • Angina pectoris.
    • Syncope.
    • Cardiac arrhythmias.
    • Pulmonary hypertension.
    • Edema.
    • Thromboembolism (blood clots obstructing circulation).
    • Sudden death.
  • Vascular stenosis:
    • Angina pectoris.
    • Syncope.
    • Myocardial infarction.
    • Cerebral infarction.
    • Stroke (cerebrovascular accident).
    • Hypertension.
    • Chronic kidney failure.
    • Edema.
    • Sudden death.
  • Urethral stenosis:
    • Urinary retention.
    • Chronic urinary tract infections.
    • Urethral stones.
    • Hydronephrosis (urine accumulation in kidneys).
    • Erectile dysfunction, premature ejaculation, or reduced ejaculate volume.
  • Esophageal stenosis:
    • Aspiration pneumonia.
    • Food impaction (food bolus stuck in the esophagus).
    • Malnutrition.
    • Dehydration.
    • Esophageal perforation.

Which doctor treats stenosis?

Several specialties are involved in the treatment of stenosis, as it may affect multiple organs. It is most commonly managed by Traumatology and Orthopedic surgery, Neurosurgery, Angiology and Vascular surgery, Cardiology, General and digestive system surgery, and Urology.

Diagnosis

Diagnosis begins with medical history, including personal and family history, physical examination, and usually blood and urine tests to assess overall health and vital organ function.

Confirmation is achieved through imaging tests:

  • X-ray: uses X-rays to produce internal images; useful for bones, heart, lungs, esophagus, and urinary system.
  • Magnetic resonance imaging (MRI): uses radio waves and a strong magnetic field to obtain detailed images; detects abnormalities in discs, ligaments, urethra, esophagus, heart chambers, and valves.
  • Computed tomography (CT): produces 360° images using X-rays; useful for bones, lungs, and abdominal organs; preferred in emergencies or in patients with metallic devices.
  • Electromyography: evaluates nerve and muscle function to confirm compression.
  • MR angiography: non-invasive technique using contrast to visualize vessel narrowing.
  • Echocardiogram: ultrasound imaging of the heart in motion to assess valve flow abnormalities.
  • Doppler ultrasound: evaluates real-time blood flow and detects narrowing or obstruction.
  • Arteriography: X-ray with contrast injected into an artery via catheter.
  • Endoscopy: flexible camera introduced through the mouth to examine the esophagus.
  • Barium swallow study: radiographic test using barium contrast to highlight esophageal narrowing.
  • Retrograde urethrography: iodinated contrast study of the urethra visualized on X-ray.
  • Cystoscopy: endoscopic evaluation of urethra and bladder.

Complementary studies:

  • Electrocardiogram (ECG): records cardiac electrical activity.
  • Stress test (ergometry): evaluates cardiac response at rest and exertion.
  • Cardiac catheterization: invasive assessment of valvular stenosis severity.
  • Esophageal manometry: measures esophageal pressure during swallowing.
  • Uroflowmetry: measures urinary flow rate, volume, and duration.

Treatment

Treatment is tailored according to the affected organ:

  • Spinal stenosis:
    • Medication:
      • Analgesics
      • NSAIDs
      • Anticonvulsants
      • Antidepressants.
    • Physiotherapy: improves strength, balance, and stability.
    • Steroid injections into compressed nerves.
    • Surgery:
      • Laminectomy: the posterior portion (lamina) of one or more vertebrae is removed to provide more space for the nerves.
      • Laminotomy: only a portion of the vertebral lamina is removed.
      • Laminoplasty: an artificial hinge is created in the cervical vertebrae (this procedure is only applicable in this region).
  • Valvular stenosis:
    • Lifestyle modifications: healthy diet, regular exercise, no smoking.
    • Medication:
      • Diuretics, calcium channel blockers, beta-blockers, or alpha-blockers to control hypertension.
      • Beta-blockers, anticoagulants, or antiarrhythmic agents to prevent irregular heartbeats.
      • Diuretics also help eliminate excess fluid from the body, which is beneficial in reducing cardiac workload.
    • Surgery:
      • Balloon valvuloplasty: this is the procedure of choice in children and adolescents, as in adults the valve tends to re-narrow. A catheter is inserted through a blood vessel in the groin and carefully advanced to the damaged valve. Once in place, the balloon at the tip of the catheter is inflated to widen the valvular opening. The balloon is then deflated and the catheter is removed after a short period.
      • Valve replacement: the damaged valve is removed and replaced with an artificial valve (mechanical, human tissue, bovine, or porcine). This can be performed using a minimally invasive approach similar to the previous procedure or via open-heart surgery.
      • Valve repair: this is less commonly performed because it generally yields poorer outcomes than replacement. During the procedure, fused valve leaflets are separated to open the orifice.
  • Vascular stenosis:
    • Lifestyle changes.
    • Medication:
      • Diuretics, calcium channel blockers, beta-blockers, or alpha-blockers to control hypertension.
      • Statins to reduce cholesterol levels.
      • Antiplatelet agents to minimize the risk of thrombus formation.
    • Surgery:
      • Balloon angioplasty and stent placement: a catheter with an inflatable balloon at its tip is inserted and inflated upon reaching the narrowed area. To keep the vessel lumen open, a metallic mesh device (stent) is deployed, which remains apposed to the vessel wall.
      • Vascular bypass: an alternative pathway is created to bypass the stenotic segment. This "bridge" is constructed using a graft made from the patient’s own vein or from synthetic material.
  • Urethral stenosis:
    • Catheterization: a catheter is inserted through the urethra into the bladder to drain urine. It is required prior to any other approach.
    • Urethral dilation: a guidewire is inserted from the urethra into the bladder and progressively dilated using increasingly larger dilators until the canal reaches an adequate diameter.
    • Paclitaxel-coated balloon dilation: mechanical dilation combined with local drug delivery; paclitaxel inhibits scar tissue formation, thereby preventing fibrosis.
    • Urethroplasty: a surgical procedure in which the narrowed segment is excised and the healthy edges are reconnected using a graft harvested from oral mucosa.
  • Esophageal stenosis:
    • Medication:
      • Proton pump inhibitors to reduce gastric acid secretion.
      • Prokinetic agents to stimulate gastrointestinal motility.
      • Steroids and corticosteroids to reduce inflammation and eosinophil infiltration in patients with eosinophilic esophagitis.
    • Dilation: an endoscope is introduced through the mouth under radiographic guidance, and a balloon catheter is inflated to dilate the esophagus. Once the appropriate diameter is achieved, the balloon is deflated and the catheter is removed. In severe cases, a stent is placed to keep the esophageal walls separated.
    • Esophagectomy: the narrowed portion of the esophagus is surgically removed and reconstruction is performed using gastric or intestinal tissue.
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