CSF Leak from a Tarlov Cyst: Clinical Presentation
The hallmark symptom of a CSF leak from a Tarlov cyst is orthostatic headache—a positional headache that worsens when upright and improves when lying flat 1. This presentation mirrors spontaneous intracranial hypotension (SIH) from any spinal CSF leak source.
Primary Symptoms
Orthostatic Headache (Most Characteristic)
- Positional nature is key: Headache develops or intensifies within 15 minutes of sitting or standing and improves within 15 minutes of lying down 1
- May be accompanied by neck stiffness 2
- Can present with subjective hearing symptoms (tinnitus, muffled hearing) 2
- Symptoms of CSF hypotension, particularly positional headaches, are positive predictors of Tarlov cyst growth and potential leak 3
Associated Neurological Features
When a Tarlov cyst leaks CSF, patients may experience:
- Severe headache in the immediate period following cyst rupture or surgical manipulation 4
- The headache pattern is consistent with low CSF pressure physiology 4
Underlying Tarlov Cyst Symptoms (May Coexist)
While evaluating for CSF leak symptoms, recognize that the Tarlov cyst itself may cause:
- Sacral/lumbosacral radicular pain
- Bowel or bladder dysfunction (incontinence)
- Sexual dysfunction
- Perineal sensory changes
- Lower extremity weakness or pain 5, 6, 7
Critical Clinical Pitfall
Do not dismiss orthostatic headache in a patient with known Tarlov cysts as unrelated. The 2023 multidisciplinary consensus guidelines emphasize that SIH should be considered in ANY patient presenting with orthostatic headache 1. Tarlov cysts can rupture spontaneously, particularly after trivial trauma, and create anterior sacral CSF fistulas 8, 9.
Mechanism of Leak
Tarlov cysts can leak through:
- Spontaneous rupture of the cyst wall 9
- Pathological fractures through weakened sacral bone (even from low-impact trauma) 8
- Surgical manipulation with excessive CSF drainage 4
- Progressive cyst growth creating a "ball-valve" phenomenon that eventually fails 3
Diagnostic Approach
When CSF leak from a Tarlov cyst is suspected:
First-line imaging: MRI brain with contrast AND whole spine MRI 1
- Look for brain sagging or pachymeningeal enhancement (present in ~80% of SIH cases)
- Identify dilated spinal venous plexus
- Visualize the Tarlov cyst and any changes in size
If MRI is inconclusive: CT myelography to demonstrate the actual leak site 9
- Can show contrast extravasation from a broken cyst
- Identifies anterior sacral CSF fistulas 8
The combination of known Tarlov cysts plus new-onset orthostatic headache should trigger immediate evaluation for CSF leak, as this represents a potentially serious but treatable complication.