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Overview

What Is Cerebrospinal Fluid Rhinorrhoea?

Cerebrospinal fluid rhinorrhoea is leakage of the clear fluid that surrounds and protects the brain and spinal cord through the nose. A tear or opening near the skull base can allow this brain fluid to enter the nasal passages. It may happen after a head injury or surgery, because of a skull-base abnormality, or spontaneously in some people. Persistent clear, watery nasal drainage needs clinical assessment because it can be a cerebrospinal fluid leak rather than an ordinary runny nose.

Symptoms

Symptoms of Cerebrospinal Fluid Rhinorrhoea

  • Persistent one-sided clear, watery nasal drainage
  • Salty or metallic taste in the mouth
  • Drainage that increases when bending forward or straining
  • Headache
  • Nausea
  • Neck stiffness
  • Sensitivity to light (photophobia)

Causes

Causes of Cerebrospinal Fluid Rhinorrhoea

Cerebrospinal fluid is normally held around the brain by a tough covering called the dura and by the bones of the skull base. A tear or hole in the dura and skull base can create a pathway for CSF to enter the nasal passages and drain from the nose.

  • Head or facial trauma, including a skull-base fracture
  • Sinus, nasal or skull-base surgery
  • Lumbar puncture or another procedure that changes CSF pressure, where relevant
  • Congenital weakness or a defect in the skull base
  • Tumour-related erosion of the skull base
  • Spontaneous leaks associated with raised intracranial pressure or tissue weakness

Risk Factors

Risk Factors

Underlying factors

Congenital skull-base differences, connective-tissue disorders, obesity, raised intracranial pressure and other tissue or pressure problems may contribute to a spontaneous leak.

Acquired factors

Previous head or facial trauma and nasal, sinus, brain or skull-base procedures can create an acquired opening through which spinal fluid leaks.

Complications

Complications

  • Meningitis, an infection of the membranes around the brain and spinal cord
  • Recurrent or persistent leakage
  • Headache related to low CSF pressure (intracranial hypotension)
  • Seizures in clinically relevant cases
  • Neurological deterioration from infection or pressure-related problems

Urgent complication

Possible meningitis needs emergency care

Fever, severe headache, neck stiffness, confusion, vomiting or marked light sensitivity with suspected cerebrospinal fluid rhinorrhoea may indicate meningitis or another urgent complication. Seek emergency care immediately.

Diagnosis

Diagnosis

Clinicians review when the drainage started, whether it changes with position or straining, and any history of injury or surgery. They may examine the nose, ears and neurological system, but a clear runny nose cannot be diagnosed as cerebrospinal fluid rhinorrhoea by appearance alone.

  • Laboratory testing of collected fluid for a CSF-specific marker such as beta-2 transferrin
  • Nasal endoscopy to inspect the nasal passages and possible leak site
  • High-resolution CT to assess the skull base and bony defects
  • MRI or MR cisternography to assess soft tissues and CSF pathways
  • Specialist-directed leak-localization studies when initial tests are inconclusive

Treatment & Management

Treatment and Management

Initial specialist management may include avoiding nose blowing, straining and heavy lifting, treating raised intracranial pressure or other contributing problems, and deciding whether a short period of observation is appropriate. The plan depends on the cause, size and location of the leak, the amount of drainage and whether complications are present.

Non-surgical and supportive treatment

Endoscopic repair

Supportive care may involve clinician-directed bed rest or activity modification, stool-softening measures and pressure management. Medicines are used only for a specific medical indication; self-medication does not seal a leak. Persistent cranial leaks are often treated with endoscopic endonasal repair, while other surgical approaches or temporary drainage may be considered for selected anatomy, recurrence or specialist indications. Follow-up checks for recurrent clear drainage or infection and addresses raised intracranial pressure or other causes to reduce recurrence.

Outlook and Prognosis

Outlook and Prognosis

Many cerebrospinal fluid leaks can be successfully sealed, but recovery varies. The outlook depends on the cause, size and location of the leak, whether infection or raised intracranial pressure is present, and whether it is traumatic, spontaneous or postoperative.

  • Symptoms may improve after the leak is closed
  • Recurrence is possible, particularly if an underlying pressure problem remains
  • Persistent or returning drainage needs reassessment
  • Urgent infection symptoms require immediate medical care

When Should You See a Doctor

When Should You See a Doctor?

Arrange prompt medical assessment for persistent or recurrent one-sided clear, watery nasal drainage, especially after a head injury, sinus or skull-base surgery. Assessment is also important when drainage increases with bending or straining, as this can occur with a leak brain fluid pathway into the nose.

Seek urgent help

Emergency warning signs

After suspected cerebrospinal fluid rhinorrhoea, contact emergency services for fever, severe or worsening headache, neck stiffness, confusion, fainting, seizures, repeated vomiting, new weakness or vision changes.