Surgery performed by Dr. Luis Ley
La microvascular decompression of the facial nerve due to hemifacial spasm made by the Dr. Luis Ley at the Ramón y Cajal University Hospital (Madrid, Spain) it can be viewed in the surgical training app SurgSchoolThis is a representative case of neurovascular conflict in the cerebellopontine angle, resolved by precise microsurgical technique and advanced neurophysiological monitoring.
Microvascular decompression in hemifacial spasm: fundamentals and planning
La microvascular decompression of the facial nerve It constitutes the etiological treatment of hemifacial spasm, a pathology usually caused by the pulsatile compression of an arterial vessel —frequently the AICA— on the entry/exit zone of the VII cranial nerve.
In this case, Dr. Luis Ley addresses a right hemifacial spasm with a classic strategy, but executed with relevant technical refinements. The supine positioning with contralateral head rotation allows optimal access to the cerebellopontine angle, minimizing cerebellar retraction.
Planning systematically incorporates intraoperative neurophysiological monitoring, including evoked potentials and recording of the “lateral spreading response” phenomenon, key both for identifying the conflict and for confirming the effectiveness of decompression.
Approach to the cerebellopontine angle without cerebellar retraction
Following the dural opening, one of the most important technical aspects of the procedure is the controlled release of cerebrospinal fluid. This allows for the gradual relaxation of the cerebellum, avoiding the use of spatulas and reducing the risk of cerebellar injury or damage to adjacent neurovascular structures.
Dr. Luis Ley demonstrates here a fundamental principle of modern microsurgery: atraumatic exposure based on intracranial pressure dynamics, instead of mechanical retraction.
Once the cerebellopontine angle is reached, the VII-VIII cranial nerve complex is identified. Correct differentiation between these two nerves is critical, especially in scenarios where the arachnoid mater is thickened, as in this case.
Identification of neurovascular conflict: AICA and VII cranial nerve
The main intraoperative finding is a conflict between the anterior inferior cerebellar artery (AICA) and the acoustic-facial bundle. Careful dissection of the arachnoid allows exposure of the exact point of compression.
Here, the systematic use of stimulation probe to map the VII and VIII cranial nerves. This step not only ensures correct anatomical identification, but also allows for real-time correlation of neurophysiological changes with decompression maneuvers.
Dr. Luis Ley emphasizes a key aspect: the disappearance of the “spreading” after mobilization of the vessel constitutes a reliable marker of effective decompression.
Vascular release and dislocation technique
Simply placing prosthetic material is not enough in many cases. In this procedure, Dr. Luis Ley performs a Progressive release of the vessel followed by active dislocation, displacing it from its original position to avoid re-contact with the nerve.
This concept—often underestimated—is crucial for long-term success. Surgery should not be limited to separating structures, but should also to stably modify the anatomical relationship between vessel and nerve.
The intraoperative neurophysiological improvement, with the disappearance of the pathological findings, confirms the effectiveness of this maneuver.
Teflon interposition: indications and technical nuances
Once vascular displacement is achieved, Teflon fragments are placed. In this case, Dr. Luis Ley uses a larger quantity than usual, with a dual purpose:
- Keep the glass in the new position
- Avoid direct contact in case of readjustment
It is important to emphasize that Teflon acts as maintenance element, not as a primary solutionThe key remains prior vascular release and dislocation.
From a technical point of view, the correct placement of the Teflon tape must avoid secondary compressions or displacements that could generate new problems.
Intraoperative neurophysiological assessment
One of the most instructive aspects of this case is the direct correlation between surgical maneuvers and neurophysiological response. The disappearance of the lateral spreading response during separation of the vessel from the facial nerve provides immediate confirmation of surgical success.
Dr. Luis Ley himself points out the value of this monitoring not only from a clinical perspective, but also from an educational one. It allows for an objective understanding of the pathophysiological mechanism of hemifacial spasm and its resolution.
Additional conflict management: protection of the fifth pair
During the cranial examination, a possible additional conflict at the level of the fifth cranial nerve was identified. Although the patient did not present with trigeminal symptoms, a preventive dissection was performed and Teflon was applied.
This gesture reflects an advanced surgical philosophy: anticipation of potential conflicts instead of reactive intervention. In certain cases, this strategy can prevent future re-interventions.
Dr. Luis Ley emphasizes that this maneuver was prophylactic, which demonstrates a dynamic and non-protocolized intraoperative assessment.
Intraoperative results and final considerations
At the end of the decompression, the patient was free of spasm according to the neurophysiological recording. This immediate result is highly predictive of a good postoperative clinical outcome.
The surgery highlights several key principles in cerebellopontine angle microsurgery:
- Exposure without retraction by CSF drainage
- Precise identification of the neurovascular conflict
- Active release and dislocation of the vessel
- Rational use of Teflon
- Neurophysiological monitoring as an intraoperative guide
The approach of Dr. Luis Ley It combines refined technique with intraoperative decision-making based on dynamic findings, which defines high-level surgery in hemifacial spasm.
