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Neurofibroma - Causes, Diagnosis, and Management

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A neurofibroma is a kind of nerve tumor that appears as soft lumps on the skin or beneath it. Read the article below to learn more about this.

Written byDr. Shikha
Medically reviewed byDr. Abhishek Juneja
Published At January 17, 2023
Reviewed AtOctober 15, 2024

What Is Neurofibroma?

Neurofibromas are tumors that form on nerves in the body and are benign or noncancerous in nature. They are made up of excess growth of nerve tissue along with blood vessels and other cells and fibers. Neurofibromas can develop on nerves in the skin, underneath the skin, or deeper inside the body, such as the abdomen, chest, and spine. A neurofibroma can occur in any minor or major nerve throughout the body. This sort of benign nerve tumor is more likely to occur near the center of the nerve. It can come from numerous nerve bundles at a time. Symptoms are frequently absent or minor. Patients may have numbness or pain in the affected area if the tumor presses against or develops into nerves. Neurofibromas are usually noncancerous tumors or benign tumors. It can turn cancerous or malignant in rare cases. These tumors are most common in adults between the ages of 20 and 40.

Neurofibromas are present at birth; however, the tumors may not be visible for years. During adolescence, neurofibromas usually become more visible. Neurofibromas have varying effects on people depending on the type, size, and location of the tumor. Some neurofibromas result in tiny lumps or thicker skin areas. Internal organs and the spinal cord might be affected by bigger neurofibromas.

What Causes Neurofibroma?

The majority of neurofibromas are linked to a hereditary condition called neurofibromatosis type 1. The neurofibromin 1 or NF1 gene produces neurofibromin, a big cytoplasmic protein with amino acids and three spliced exons. Neurofibromin is a tumor suppressor protein that generally prevents cells from proliferating or developing too fast. It accomplishes this by controlling the ras protein, which promotes cell growth and division. When the NF1 gene is mutated, it stops preventing cell proliferation, allowing cells to multiply and turn into tumors. Multiple neurofibromas, as well as other symptoms, might result from this. People who do not have neurofibromatosis can develop solitary neurofibromas, which are also called sporadic neurofibromas. Their etiology is unknown, though the contribution of trauma is being investigated by researchers. The majority of sporadic neurofibromas are painless and can be treated without medication or surgery.

Schwann cells are divided into two types: myelinating and non-myelinating. Non-myelinating Schwann cells surround small-diameter peripheral nervous system axons with their cytoplasmic processes, whereas myelinating Schwann cells cover big-diameter peripheral nervous system axons with a myelin sheath. Neurofibromas are characterized by non-myelinating Schwann cells. Since non-myelinating Schwann cells are the source of neurofibromas, the mutations that cause them to convert happen in Schwann cell progenitors during early nerve development. Neurofibromas are caused by non-myelinating Schwann cells, which only exhibit the inactive form of the neurofibromin 1 or NF1 gene, resulting in the absence of functional neurofibromin production.

What Are the Types of Neurofibromas and the Symptoms They Exhibit?

Neurofibromas are categorized according to where they develop and how deeply they are embedded in the body. The symptoms vary based on the type, location, and size of the tumor. Dermal and plexiform neurofibromas are the two main types of neurofibromas. Plexiform neurofibromas are linked with several nerve bundles, whereas dermal neurofibromas are related to a single peripheral nerve. Plexiform neurofibroma is more challenging to manage and has the potential to develop into cancerous tumors. Dermal neurofibroma does not progress to cancer.

  • The most prevalent type of neurofibroma is cutaneous or dermal neurofibroma, which is linked to the NF1 gene. They appear as rubbery lumps or bumps on or just beneath the skin, and their size and quantity can fluctuate. Cutaneous neurofibromas can grow and multiply as people become older, but they usually do not cause any symptoms other than itching and soreness. Some, on the other hand, grow unusually large or in uncomfortable locations, causing aesthetic concerns and other problems.

  • Intramuscular neurofibromas develop on the tiny nerves present in the muscles. This may cause discomfort.

  • Spinal neurofibromas are tumors that form on the nerves that leave the spine. Spinal neurofibromas are more prevalent in adults than in children, and if they get big enough, they can compress nerves, causing weakness, pain, and numbness.

  • Diffuse neurofibromas grow in the skin, not just on the surface; they can go deep into the skin's layers and down to the fascia or the base layer. They show elevated, tan-colored spots on the head, trunk, and other portions of the body that are soft to the touch.

  • A plexiform neurofibroma can develop in any part of the body. The name plexiform refers to the fact that they affects the nerve plexus, which is a network of small and large nerves that serves a specific portion of the body. However, other tissue types, such as muscles and connective tissues, can be affected by these rare malignancies. Plexiform neurofibromas are linked to NF1 and can appear at birth, though they can be difficult to identify in children. Most plexiform neurofibromas are harmless, but some can develop to be quite large, putting strain on nerves and organs and causing discomfort and paralysis. Plexiform neurofibromas could become malignant, even if they start out benign, and should be regularly watched by a physician.

  1. Diffuse Plexiform Neurofibromas: It can cause the underlying tissue and skin to expand, resulting in deformities. The head and face are sometimes affected by these malignancies.

  2. Nodular Plexiform Neurofibromas: It affects the major nerves leaving the spine, such as the sciatic nerve. On imaging scans, they can appear as thicker regions on the nerve, which are not always seen by the human eye.

How to Diagnose Neurofibroma?

A neurofibroma can develop for no apparent reason or in persons who have the genetic disorder neurofibromatosis type 1. A physical examination, a conversation with the patient about their medical history, or the results from an imaging test such as a computerized tomography (CT) or magnetic resonance imaging (MRI) scan will help the doctor identify neurofibroma. These imaging techniques can aid in determining the location of the tumor, detecting extremely small tumors, and determining which tissues are impacted or nearby. A positron emission tomography (PET) scan may be ordered by the doctor to determine whether the tumor is benign. Before surgery, the patient may have a radiologist do a biopsy to diagnose the mass as a neurofibroma.

What Is the Management of Neurofibroma?

A single, little less than an inch, which is approximately two centimeters in dimension, tumor under the skin normally does not require neurofibroma treatment. Neurofibroma is usually treated with either monitoring or surgery. If the tumor is in a location that makes its removal challenging or if it is small and produces no concerns, the doctor may propose surveillance. Regular examinations and imaging tests are used to assess if the tumor is expanding.

The tumor is removed through surgery by eliminating all or part of the tumor that is pushing on adjacent tissue or causing organ damage and alleviating the symptoms. The sort of procedure required is determined by the location and size of the tumor, as well as if it is interwoven with multiple nerves. The aim of surgery is to remove as much of the tumor as feasible while avoiding additional nerve injury.

Physical therapy may be required following surgery. Physical and occupational therapists can lead patients through activities that keep their muscles and joints active, avoid stiffness, and help them regain function and feel better.

Conclusion:

Being told that someone has a benign tumor may not be as frightening as being told they have a cancerous tumor. On the other hand, a benign tumor-like neurofibroma might have a significant influence on an individual’s life. Neurofibromas can change the way you appear. Neurofibromas can grow big enough to harm neighboring organs and tissues in certain individuals. If someone has been diagnosed with neurofibromas, talk to a doctor about having them surgically removed. Neurofibromas are signs of neurofibromatosis, a rare genetic disease that can cause severe health conditions. Inquire with the doctor if the tumor is a sign of neurofibromatosis.

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Frequently Asked Questions

Neoplasms that develop from the cells encircling nerves in the peripheral or central nervous system are known as tumors of the nerve sheath. Malignant tumors like MPNSTs or benign tumors like schwannomas or neurofibromas can also take the form of this condition.
Depending on the size, location, and surgical technique utilized when removing neurofibromas from the face, it may leave only a little scar, although total scarless removal is difficult to do.
An abnormal growth that arises from the cells surrounding the peripheral nerves is referred to as a tumor in the sheath of the peripheral nerve. It can include a variety of tumors, including schwannomas and neurofibromas, which can present symptoms and call for therapy or medical attention.
Patients with brain tumors may experience vision loss even though the optic nerve is not directly harmed because of the tumor's position and its effect on the brain's visual circuits. A disruption in the flow of visual information caused by compression or infiltration of the optic tracts or visual cortex can impair vision.
Localized pain, numbness or tingling, muscle weakness, and altered sensory perception can all be symptoms of a tumor pressing against a nerve in the affected area that the compressed nerve serves. The location, size, and affected nerves all affect the individual symptoms.
There are few effective natural remedies for nerve sheath tumors; however, leading a healthy lifestyle and utilizing complementary therapies like acupuncture or massage may help control symptoms and enhance well-being. However, conventional therapies and medical advice are necessary for optimal management and should not be completely substituted by all-natural methods.
Swallowing is a complicated process requiring numerous nerves and muscle coordination in the throat and esophagus, so even if the vagus nerve is gone as a result of a neck tumor, swallowing can still happen. The vagus nerve can be replaced by other healthy nerves and compensating systems, preserving swallowing.
The patient can anticipate a potential improvement in tumor-related symptoms such as voice alterations, swallowing issues, or nerve-related pain after the removal of a single vagus nerve tumor. However, there may be a chance of surgery-related consequences, such as nerve injury that might be either temporary or permanent and affect the ability to swallow or use the vocal cords.
Surgery is usually required to remove an optic nerve tumor, and this may entail methods like craniotomies or endoscopic procedures. Taking into account elements including tumor size, location, and patient-specific variables, the objective is to access and remove the tumor while maintaining or restoring visual function.
Depending on the form, location, and unique characteristics of the patient, a spinal nerve sheath tumor is often treated with a combination of surgical excision, radiation therapy, and/or chemotherapy. To choose the best course of treatment, a multidisciplinary approach comprising neurosurgeons, radiation oncologists, and medical oncologists is necessary.
Depending on the location, size, and kind of the tumor, as well as the person's pain threshold and tolerance, pressing a tumor against a nerve can result in varied degrees of pain, ranging from a little discomfort to severe and incapacitating anguish.
Following tumor excision, the length depending on the type of tumor, nerve discomfort may differ greatly, the size of the operation, the patient's recovery, and the success of post-operative care. While some people could experience brief discomfort that disappears within a few weeks or months, others might experience lingering or chronic nerve-related problems that call for continuous treatment or rehabilitation.
Schwann cells, or perineurial cells, which are the supporting cells of the peripheral nerves, give rise to tumors in the nerve sheath due to their aberrant development and proliferation. Although the precise causes of these tumors are not fully understood, they can occur as a result of genetic changes or modifications.
Diagnostic procedures, including imaging investigations (for example, MRI, CT scan) and nerve conduction tests, could be performed to evaluate the functionality of the nerve and find any anomalies or lesions along its route in order to ascertain whether the phrenic nerve has a tumor or has been damaged.
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Dr. Abhishek Juneja

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