Spinal cord tumors

Spinal Cord Tumors: Causes, Symptoms, and Treatment

Spinal cord tumors refer to abnormal growths that develop in the soft tissues of the spinal cord or spinal membranes, affecting the spinal bones. Known as intradural tumors, these tumors present different symptoms depending on their size and location. As the spinal cord plays a critical role in transmitting brain functions throughout the body, cancerous cells in this region can result in severe health complications. However, spinal cord tumors are generally rare, and most are benign (non-cancerous). Surgical treatment is often employed, and advancements in modern medicine have significantly reduced risks, improving patient outcomes.

Causes of Spinal Cord Tumors

The exact causes of spinal cord tumors remain unknown, but genetic factors are thought to play a significant role in their development. However, it is unclear whether genetic abnormalities occur due to hereditary causes or environmental factors. Some studies associate spinal cord tumors with exposure to chemicals, while others link them to genetic conditions like von Hippel-Lindau disease or neurofibromatosis type 2. Additional causes may include radiation exposure, certain viruses, and cancer cells spreading from surrounding organs.

Symptoms of Spinal Cord Tumors

Damage to the spinal cord, a crucial part of the central nervous system, can impact the entire body. Symptoms vary depending on the tumor’s location and type. The primary symptom is pain, which tends to worsen at night. In some cases, the pain persists even during rest, affecting not only the site of the tumor but radiating across the entire back. These severe and persistent pains, particularly common in younger patients, are often the first sign pointing to the possibility of a spinal cord tumor.

In addition to direct tumors in the spinal cord, tumors in the spine may compress the spinal cord, causing other symptoms depending on the pressure’s location. Common symptoms of spinal cord tumors include:

• Severe, uncontrollable pain in the back, neck, or abdomen
• Numbness in the chest, arms, or legs
• Weakness in muscles of the arms or legs
• Difficulty maintaining balance or walking
• Changes in bowel movements
• Extreme sensitivity to heat
• Skeletal deformities such as scoliosis (especially in children)

For example, tumors in the lumbar region may cause numbness in the legs, while tumors in the cervical region may result in neck pain.

Types of Spinal Cord Tumors

Spinal cord tumors are categorized by their source:

1. Extradural tumors (external)
2. Intradural tumors (internal)

Around 40% of cases involve tumors that are generally benign. In 10% of cases, the tumors are metastatic and cancerous.

Extradural Tumors

Extradural tumors develop slowly and account for about 55% of spinal cord tumors. They can be further classified as:

• Metastatic tumors: These result from the spread of cancer cells through the bloodstream from other organs, such as the lungs, kidneys, prostate, or breasts. These tumors typically develop slowly and are more common in men aged 40-60.
• Primary spinal tumors: These are rarer and usually benign, occurring more often in younger individuals (around age 20). However, they can cause more serious issues in older adults.

Intradural Tumors

Intradural tumors develop directly within the spinal cord or its membrane. They often arise from nerve roots, blood vessels, or metastatic cancer cells. Approximately 90% of intradural tumors are benign but grow more rapidly than extradural tumors, requiring prompt treatment.

Two main types of intradural tumors include:

• Schwannoma / Neurofibroma: These tumors originate from Schwann cells and are usually benign and slow-growing. They are most common in adults aged 30-50 and often occur in the thoracic spine.
• Meningioma: These tumors develop from the spinal meninges (membrane) and are more common in women. They often appear in patients over 50 years old and are most frequently found in the neck, thoracic, or lumbar spine. Meningiomas typically cause severe back pain in the early stages and are usually removed through surgery.

Diagnosis of Spinal Cord Tumors

Diagnosing spinal cord tumors involves evaluating the patient’s symptoms and medical history through a thorough neurological examination. Imaging techniques used for diagnosis include:

• MRI (Magnetic Resonance Imaging): The most accurate tool for detecting spinal cord tumors.
• CT scans: Often used to assess the tumor’s interaction with surrounding bones.
• Bone scintigraphy: Helps identify whether the tumor has spread to other areas.
• Biopsy: A small tissue sample may be taken under local anesthesia to determine the tumor’s type and guide treatment.

Treatment Options for Spinal Cord Tumors

The choice of treatment depends on the tumor’s location, type, and size. Common treatment methods include surgery, chemotherapy, and radiotherapy.

Surgery

Surgical removal is the primary treatment for most spinal cord tumors, especially benign ones. Advances in minimally invasive techniques such as microsurgery have improved outcomes, allowing tumors to be removed with small incisions.

• For benign tumors, complete removal is usually possible, especially if the tumor is confined to the spinal membrane or cord.
• Malignant tumors may require partial removal to avoid damage to surrounding tissues, followed by additional treatments like chemotherapy or radiotherapy. In some cases, implants may be used to stabilize the spine after surgery.

Chemotherapy

Chemotherapy uses drugs to treat cancer, though its use in spinal cord tumors is limited due to the prevalence of benign tumors in these cases. It is sometimes applied before surgery to shrink the tumor.

Radiotherapy

Radiotherapy, also known as radiation therapy, is another treatment option, particularly for tumors sensitive to radiation. It can be used before or after surgery to target cancerous cells.

Frequently Asked Questions

Is a spinal cord tumor life-threatening?
Most spinal cord tumors are benign and do not spread to other parts of the body. However, early diagnosis is crucial to prevent damage to the spine and nerves. Delayed treatment may lead to severe complications, including paralysis.

Can a spinal cord tumor recur after surgery?
While the goal of surgery is to remove the tumor completely, malignant tumors may not be entirely removable to avoid harming surrounding tissues. In such cases, chemotherapy or radiotherapy may be used to prevent recurrence. However, there is always a risk that the tumor may return.

What precautions should be taken after surgery?
After surgery, patients should keep the surgical site clean, take prescribed medications on time, attend regular follow-ups, and avoid strenuous physical activities to minimize risks.

When is surgery necessary for spinal cord tumors?
Surgery is often required if the tumor grows rapidly or causes neurological symptoms such as loss of motor function or bladder control. The timing of surgery depends on the tumor’s growth rate and the patient’s overall condition at the time of diagnosis.