What Is Thoracic Disc Herniation?
Thoracic disc herniation (TDH) is a rare spinal condition that occurs when intervertebral disc material protrudes into the spinal canal at the thoracic level, leading to compression of the spinal cord or nerve roots. Due to the narrow diameter of the thoracic spinal canal and the presence of the spinal cord, thoracic disc herniations carry a higher risk of neurological impairment compared to cervical and lumbar disc herniations.
Causes and Risk Factors
Thoracic disc herniation usually develops through a combination of degenerative changes and mechanical stress. The main contributing factors include:
Degenerative Changes
With aging, intervertebral discs lose water content and elasticity, leading to structural weakening. Degeneration is the most common underlying mechanism for thoracic disc herniation.
Trauma and Mechanical Load
Sudden axial loading of the spine
Falls or direct thoracic trauma
High-energy injuries
Repetitive or Prolonged Mechanical Stress
Prolonged desk-based work
Sustained poor posture
Occupations involving long periods of static positioning
Structural and Anatomical Factors
Abnormal thoracic kyphosis
Calcified or hard disc herniations
Ossification of the posterior longitudinal ligament (OPLL)
Lifestyle Factors
Smoking
Sedentary lifestyle and weak core musculature
Poor sitting, sleeping, and working posture
Symptoms
Clinical symptoms depend on the location, size, and consistency (soft or calcified) of the herniated disc, as well as the degree of spinal cord or nerve root compression.
Common Symptoms
Mid-back (thoracic) pain.
Band-like chest or abdominal pain (thoracic radiculopathy).
Sensory disturbances below the level of compression.
Gait imbalance.
Lower extremity weakness or stiffness.
Spasticity.
Bladder or bowel dysfunction in advanced cases.
Progressive neurological symptoms strongly suggest spinal cord involvement and require urgent evaluation.
Diagnostic Method
Neurological Examination: Comprehensive assessment of muscle strength, reflexes, sensory level, coordination, and signs of myelopathy such as hyperreflexia or pathological reflexes.
Magnetic Resonance Imaging (MRI): The gold standard for diagnosing thoracic disc herniation. MRI demonstrates disc morphology, spinal cord compression, intramedullary signal changes, and associated pathologies.
Computed Tomography (CT): Particularly valuable for identifying calcified thoracic disc herniations, which are common at this level and critically influence surgical planning.
Electromyography (EMG): Helps evaluate nerve involvement and differentiate thoracic radiculopathy from peripheral neuropathies.
Treatment Approaches
Not Every Patient Requires Surgery!
Many thoracic disc herniations are asymptomatic or mildly symptomatic. Conservative treatment is appropriate in patients without progressive neurological deficits or signs of myelopathy.
1. Conservative (Non-Surgical) Treatment
a. Activity Modification and Pain Control
Short-term rest during acute pain episodes
Avoidance of activities that increase thoracic spinal load
b. Medication
Nonsteroidal anti-inflammatory drugs (NSAIDs)
Muscle relaxants for paraspinal muscle spasm
Neuropathic pain medications when radicular pain is present
c. Physical Therapy
Postural correction
Core and paraspinal muscle strengthening
Gentle thoracic mobility exercises
Aggressive manipulative or forceful manual therapies are not recommended in thoracic disc herniation.
d. Lifestyle Modifications
Smoking cessation
Ergonomic workplace adjustments
Weight control
Regular low-impact physical activity
2. Surgical Treatment (If Necessary)
Indications for Surgery
Surgical intervention is considered in the presence of:
Progressive myelopathy.
Radiological evidence of spinal cord compression.
Development of motor weakness.
Bladder or bowel dysfunction.
Persistent or recurrent pain despite adequate conservative treatment.
Large, calcified, or centrally located thoracic disc herniations.
Surgical Procedures
Microsurgical Thoracic Discectomy
Microsurgical techniques enable precise decompression of the spinal cord and nerve roots while minimizing neural manipulation. The choice of surgical approach depends on the disc’s location, size, and consistency.
1.Posterolateral Approaches (Transpedicular / Costotransversectomy)
Preferred for lateral or paramedian disc herniations
Avoid direct posterior spinal cord retraction
Suitable for selected soft and calcified discs
2.Anterior and Anterolateral Approaches (Thoracotomy / Thoracoscopic Surgery)
Anterior and anterolateral approaches are indicated for central, giant, or calcified thoracic disc herniations, where posterior access may pose an unacceptable risk to the spinal cord.
Thoracic disc surgery using posterolateral, anterior or anterolateral approaches is inherently multidisciplinary. Thoracotomy or thoracoscopic exposure of the thoracic spine is performed by an experienced thoracic surgery team. Following safe access to the thoracic cavity, the neurosurgeon performs microsurgical disc excision and spinal cord decompression.
This collaborative approach:
Ensures safe access to the thoracic spine.
Minimizes pulmonary and vascular complications.
Allows optimal visualization of the disc and spinal cord.
Neuro-Monitoring
Intraoperative somatosensory and motor evoked potential monitoring is strongly recommended during thoracic disc surgery to enhance neurological safety.
Close coordination between neurosurgery, thoracic surgery, and anesthesia teams is essential throughout the procedure to maximize patient safety and surgical precision.