Definition

What is cranial mononeuropathy III?

The third cranial nerve is called the oculomotor nerve, and it is responsible for the eyelids and their movements. Cranial mononeuropathy III is a nerve disorder. It affects the function of the third cranial nerve. As a result, the person may have double vision and eyelid drooping.

How common is cranial mononeuropathy III?

Please discuss with your doctor for further information.

Symptoms

What are the symptoms of cranial mononeuropathy III?

The common symptoms of cranial mononeuropathy III are:

  • Double vision, which is the most common symptom
  • Drooping of one eyelid (ptosis)
  • Enlarged pupil that does not get smaller when a light shines on it
  • Headache or eye pain

Other symptoms may occur if the cause is a tumor or swelling of the brain. Decreasing alertness is serious, because it could be a sign of brain damage or impending death.

There may be some symptoms not listed above. If you have any concerns about a symptom, please consult your doctor.

When should I see my doctor?

If you have any signs or symptoms listed above or have any questions, please consult with your doctor. Everyone’s body acts differently. It is always best to discuss with your doctor what is best for your situation.

Causes

What causes cranial mononeuropathy III?

Mononeuropathy means that only one nerve is affected. This disorder affects the third cranial nerve in the skull. This is one of the cranial nerves that control eye movement. Causes may include:

  • Brain aneurysm
  • Infections
  • Abnormal blood vessels (vascular malformations)
  • Sinus thrombosis
  • Tissue damage from loss of blood flow (infarction)
  • Trauma (from head injury or caused accidentally during surgery)
  • Tumors or other growths (especially tumors at the base of the brain and pituitary gland)

In rare cases, people with migraine headaches have a temporary problem with the oculomotor nerve. This is probably due to a spasm of the blood vessels. In some cases, no cause can be found.

People with diabetes may also develop a neuropathy of the third nerve.

Risk factors

What increases my risk for cranial mononeuropathy III?

Please discuss with your doctor for further information.

Diagnosis & treatment

The information provided is not a substitute for any medical advice. ALWAYS consult with your doctor for more information.

How is cranial mononeuropathy III diagnosed?

An eye examination may show:

  • Enlarged (dilated) pupil of the affected eye
  • Eye movement abnormalities
  • Eyes that are not aligned

Your health care provider will do a complete examination to find out if other parts of the nervous system are affected. Depending on the suspected cause, you may need:

  • Blood tests
  • Tests to look at blood vessels to the brain (cerebral angiogram, CT angiogram, or MR angiogram)
  • MRI or CT scan of the brain
  • Spinal tap (lumbar puncture)

You may need to be referred to a doctor who specializes in vision problems related to the nervous system (neuro-ophthalmologist).

How is cranial mononeuropathy III treated?

Some people get better without treatment. Treating the cause (if it can be found) may relieve the symptoms.

Other treatments to relieve symptoms may include:

  • Corticosteroid medicines to reduce swelling and relieve pressure on the nerve (when caused by a tumor or injury)
  • Eye patch or glasses with prisms to reduce double vision
  • Pain medicines
  • Surgery to treat eyelid drooping or eyes that are not aligned

Some people will respond to treatment. In a few others, permanent eye drooping or loss of eye movement will occur.

Lifestyle changes & home remedies

What are some lifestyle changes or home remedies that can help me manage cranial mononeuropathy III?

To reduce your risk of developing cranial mononeuropathy III, it’s advisable to get timely treatment for any conditions that may press on the nerve.

If you have any questions, please consult with your doctor to better understand the best solution for you.

 

Hello Health Group does not provide medical advice, diagnosis or treatment.

Sources

Review Date: August 24, 2018 | Last Modified: August 24, 2018

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