CSF Leaks
Mr Ali Qureishi regularly treats patients with CSF leak. He is a member of the Oxford Skull Base MDT and works alongside neurosurgeons to offer the
latest minimally invasive treatment strategies.
What is CSF Leak?
Understanding the condition
Cerebrospinal fluid (CSF) is clear fluid surrounding and protecting the brain and spinal cord. A leak occurs when it escapes through a defect in its covering. At the skull base, fluid can pass into the nose or ear. A nasal leak is called CSF rhinorrhoea.
Symptoms and causes
A nasal leak may cause watery drainage, often from one nostril. It can be intermittent and may be more noticeable on bending forward. A salty taste can occur. These symptoms are not specific: ordinary rhinitis is much more common. Leaks may follow injury or surgery, or occur spontaneously, sometimes with raised pressure around the brain.
Why assessment matters
An untreated skull base leak can allow infection to reach the tissues around the brain, causing meningitis.
Seek prompt medical advice about suspected leakage. Clear drainage after a recent head injury requires urgent assessment.
Emergency symptoms
Call 999 or go to A&E if you develop symptoms suggesting meningitis, such as severe headache with fever, neck stiffness, confusion, marked drowsiness or sensitivity to light. Do not wait for a rash or for every symptom to appear.
History and examination
Your specialist will ask about the pattern of drainage, previous injury or operations, headaches and visual symptoms. Examination of the nose and ears helps guide further tests. Nasal endoscopy may help, but a small or intermittent leak may not be visible at an appointment.
Testing the fluid
A laboratory can test a sample of nasal fluid for beta-2 transferrin, a protein strongly associated with CSF. Your team will explain how to collect a suitable sample. This helps distinguish a CSF leak from ordinary nasal secretions. Home glucose-strip testing is not a reliable substitute.
Locating the leak
High-resolution CT helps identify defects in the skull base bone. MRI can assess fluid pathways and soft tissues. If the site remains uncertain, specialist tests may be needed; some involve a lumbar puncture and contrast or a tracer. These are selected individually because they have additional risks.
If the first tests are negative
Intermittent leakage or an inadequate sample can make diagnosis difficult. Persistent symptoms may require repeat collection or further imaging. The result of one test must be considered alongside the history and examination.
How is a CSF leak diagnosed?
How is a csf leak treated?
An individual treatment plan
Treatment depends on the cause, location and duration of the leak. Selected recent traumatic leaks may settle with closely supervised measures to reduce strain. Persistent or spontaneous nasal leaks commonly require repair. Do not rely on bed rest at home without specialist assessment.
Endoscopic repair
Many nasal leaks can be repaired through the nostrils using an endoscope, without an external facial incision. Tissue grafts or a flap seal the defect. Complex sites may need a different approach. Risks include recurrent leakage, infection, bleeding and damage to nearby structures; your surgeon will explain risks specific to the repair.
Pressure control and recovery
The team may assess raised intracranial pressure and recommend treatment to reduce recurrence risk. A temporary lumbar drain is used in selected cases. Follow the team’s instructions on nose blowing, heavy lifting, straining, activity and follow-up. Report renewed clear drainage promptly, and seek emergency help for meningitis symptoms.
How spinal leaks differ
Spinal CSF leaks can cause headaches that worsen upright and improve when lying down. Treatments may include an epidural blood patch or targeted repair. A blood patch is not the usual treatment for a nasal skull base leak. The investigations and treatment pathways are different.