The Apuzzo (Subgaleal) Plane in VP Shunting
I need to clarify an important point: The term "Apuzzo plane" does not appear in the neurosurgical literature regarding VP shunt placement, and the provided evidence does not reference this specific anatomical plane or technique. You may be conflating terminology or referring to a technique described by Dr. Michael Apuzzo that isn't captured in standard shunt literature.
What You're Likely Asking About: The Subgaleal Space
Based on your question context, you're probably asking about the subgaleal (subgaleal) space used in ventriculosubgaleal shunting, which is a distinct anatomical plane relevant to shunt surgery.
Anatomical Definition
The subgaleal space is the fibroareolar layer between the galea aponeurotica and the periosteum of the scalp 1. This elastic, absorptive space can accommodate cerebrospinal fluid and serves as either:
- A temporary CSF diversion site (ventriculosubgaleal shunt)
- A tunneling plane for standard VP shunt hardware
Clinical Applications
1. As a Temporary Shunt Destination (Ventriculosubgaleal Shunt)
Ventriculosubgaleal shunts are primarily indicated for temporary CSF diversion in premature/low birth weight infants with post-hemorrhagic or post-infectious hydrocephalus 2, 3. This approach:
- Allows time for CSF protein content to decrease before permanent shunt placement
- Avoids VP shunt dependency in approximately 40-50% of cases 2
- Functions as a closed system, reducing infection risk compared to external ventricular drains 1
- Is particularly useful in infants with mean gestational age around 31 weeks and birth weight 1500-2000g 2
Key complications include CSF leak (13.3%) and wound dehiscence (6.6%), but notably has lower infection rates than external drainage systems 2, 1.
2. As a Tunneling Plane for Standard VP Shunts
Proper placement of shunt hardware in the subgaleal plane (rather than subcutaneous) reduces wound breakdown and skin complications over the shunt 4. This is a critical technical nuance:
- The shunt tubing should be tunneled deep to the galea but superficial to the periosteum
- Avoids tension on overlying skin
- Reduces erosion risk, especially important in infants with thin scalp tissue
What Matters Most for VP Shunt Success
Since the evidence doesn't support an "Apuzzo plane" concept, here's what actually impacts shunt survival based on the highest quality guidelines:
Critical Technical Points
The single most important factor for shunt survival is positioning the ventricular catheter tip surrounded by CSF, away from ventricular walls and choroid plexus (HR 0.21 for failure when surrounded by CSF vs. brain tissue, p=0.0001) 5.
Regarding entry point: There is insufficient evidence to recommend frontal versus occipital entry—both are acceptable options 5. However, consider:
- Occipital entry may be advantageous in infants due to less catheter migration with skull growth 5
- Frontal entry shows less ventricular catheter shortening over time in some studies, but evidence is mixed
- Anterior entry points generally preferred over posterior in contemporary practice 4
Practical Algorithm for Entry Point Selection
For infants <1 year:
- Consider occipital-parietal entry to minimize catheter migration with growth
- Target frontal horn, away from choroid plexus
For older children/adults:
- Frontal entry is standard
- Target frontal horn in optimal CSF-surrounded position
Regardless of entry point:
- Ensure catheter tip is surrounded by CSF on imaging
- Avoid contact with choroid plexus or ventricular walls
- Distance from choroid plexus matters more than exact anatomical location
Common Pitfalls
- Don't confuse subgaleal space with subcutaneous tunneling—the subgaleal plane is deeper and provides better tissue coverage
- Don't assume optimal initial placement guarantees long-term success in infants—frontal entry catheters can migrate with growth 5
- Don't place catheter tips in the atrium—higher proximal occlusion rates compared to frontal horn (p<0.001) 5
If you're referring to a specific technique or plane described by Dr. Apuzzo that I'm not capturing, please clarify the specific anatomical landmarks or surgical steps you're asking about.