Benign peripheral nerve tumor | health conditions & clinical trials Dehradun, Uttrakhand

1. Benign Peripheral Nerve Tumor
Your peripheral nerves link your brain and spinal cord to other parts
of your body. These nerves control your muscles so that you can walk,
blink, swallow, pick things up and do other activities.
Several types of nerve tumors occur. Though their cause is usually
unknown, some are hereditary.
Most tumors aren't cancerous (malignant), but they can lead to nerve
damage and loss of muscle control. That's why it's important to see
your doctor when you have any unusual lump, pain, tingling or
numbness.
TYPES
Peripheral nerve tumors affect nerves by growing within them
(intraneural tumors) or by pressing against them (extraneural
tumors). Most are benign. Different types of benign peripheral nerve
tumors include:
1) Schwannoma​. The most common benign peripheral nerve
tumor in adults, a schwannoma, can occur anywhere. It typically
comes from a single bundle (fascicle) within the main nerve and
displaces the rest of the nerve. Some schwannomas may enlarge
and assume unusual shapes within your spine or pelvis, such as
dumbbell tumors. If you develop a schwannoma in an arm or leg,
you may notice a mass.

2. When a schwannoma grows larger, more fascicles are affected,
making removal more difficult. In general, they grow slowly.
Schwannomas most commonly occur as solitary tumors, though
occasionally individuals may have several of them in the arms, legs or
body, a condition known as schwannomatosis.
2) Neurofibroma. ​This common type of benign nerve tumor
tends to form more centrally within the nerve. A neurofibroma
may arise from several nerve bundles and tends to cause mild
symptoms. This tumor most commonly develops in people who
have neurofibromatosis 1 (NF1).
Doctors usually diagnose people who have NF1 by examining
discolorations or benign tumors on their skin. Some people who have
NF1 may develop other conditions, such as curvature of the spine
(scoliosis), another bone deformity or an eye nerve tumor (optic
glioma). Patients with NF1 are at risk of developing a malignant
peripheral nerve sheath tumor.
3) Perineurioma.​ This rare benign peripheral nerve tumor can
also develop as an extraneural tumor. An intraneural
perineurioma occurs most commonly in children and young
adults and typically causes gradually progressive weakness and
sensory loss involving an arm or leg.
4) Lipoma.​ Slow-growing fat cells cause these benign, soft lumps
that usually appear under the skin on the neck, shoulders, back
or arms. A lipoma near a nerve may compress it. Usually, though,
they cause no pain or other problems. Your doctor may want to
monitor it through regular checkups.
5) Ganglion cyst​. Some of these cysts come from an injury, but
most have no known cause. They commonly form around joints,
such as your wrist, and can cause pain and interfere with

3. everyday activities. Some go away without treatment, but
ganglion cysts that compress neighboring nerves should be
removed.
Causes
The cause of benign peripheral nerve tumors usually isn't known.
Some are inherited. The most common type is a schwannoma. It
typically starts in a single bundle inside the main nerve and displaces
the rest of the nerve. Another common type is a neurofibroma. They
often form inside the nerve. Sometimes they arise from several nerve
bundles. Perineuriomas are rare and can grow from inside or outside
the nerve. Tumors outside a nerve can cause problems when they
press on the nerve. Other benign tumors that form outside nerves are
soft lumps of slow-growing fat cells called lipomas and ganglion cysts.