Microvascular decompression for hemifacial spasm outcome

Microvascular decompression for hemifacial spasm outcome

Microvascular decompression is an effective treatment for hemifacial spasm. Given that postoperative delayed cure was unavoidable, even with accurate identification of the offending vessel and sufficient decompression of the root exit zone, the delayed cure should be considered in patients undergoing reoperation due to lack of remission or relapse after the operation. Additionally, the timing of efficacy assessments should be delayed 1).

The definitive treatment for hemifacial spasm is microvascular decompression (MVD), which cures the disease in 85% to 95% of patients according to reported series. In expert hands, the MVD procedure can be done with relatively low morbidity.

Post-operatively, there may be episodes of mild HFS, however they usually begin to diminish 2–3 days following MVD. Severe spasm that does not abate suggests failure to achieve adequate decompression, and reoperation should be considered.

Surgical results of MVD depends on the duration of symptoms (shorter duration has better prognosis) as well as on the age of the patient (elderly patients do less well). Complete resolution of HFS occurred in 44 (81%) of 54 patients undergoing MVD, however, 6 of these patients had relapse 2). 5 patients (9%) had partial improvement, and 5 (9%) had no relief.


Complete resolution of spasm occurs in ≈ 85–93% 3) 4) 5) 6) 7). Spasm is diminished in 9%, and unchanged in 6% 8). Of 29 patients with complete relief, 25 (86%) had immediate post-op resolution, and the remaining 4 patients took from 3 mos to 3 yrs to attain quiescence.

Recurrence

References

1)

Li MW, Jiang XF, Wu M, He F, Niu C. Clinical Research on Delayed Cure after Microvascular Decompression for Hemifacial Spasm. J Neurol Surg A Cent Eur Neurosurg. 2019 Oct 10. doi: 10.1055/s-0039-1698461. [Epub ahead of print] PubMed PMID: 31600810.
2)

Auger RG, Peipgras DG, Laws ER. Hemifacial Spasm: Results of Microvascular Decompression of the Facial Nerve in 54 Patients. Mayo Clin Proc. 1986; 61:640–644
3)

Rhoton AL. Comment on Payner T D and Tew J M: Recurren ce of Hemifacial Spasm After Microvascular Decompression. Neurosurgery. 1996; 38
4)

Jannetta PJ. Neurovascular Compression in Cranial Nerve and Systemic Disease. Ann Surg. 1980; 192:518–525
5)

Loeser JD, Chen J. Hemifacial Spasm: Treatment by Microsurgical Facial Nerve Decompression. Neurosurgery. 1983; 13:141–146
6)

Huang CI, Chen IH, Lee LS. Microvascular Decompression for Hemifacial Spasm: Analyses of Operative Findings and Results in 310 Patients. Neurosurgery. 1992; 30:53–57
7) , 8)

Payner TD, Tew JM. Recurrence of Hemifacial Spasm After Microvascular Decompression. Neurosurgery. 1996; 38:686–691

XIV National Congress of the Spanish Skull Base Society SEBAC

Official language spanish

see Program here 

We are pleased to address you to present the XIV National Congress of the Spanish Skull Base Society SEBAC, which will be held in Alicante on October 24 and 25, 2019, under the slogan “Multidisciplinary work in Skull Base Surgery”. The pre-congress “Surgical Anatomy of the 3D Skull Base” will be held on Wednesday, October 23, 2019.

It is a great satisfaction for us to invite you to participate in this meeting, oriented to the participation and interaction between professionals, in which we will be able to share new perspectives for the study and debate of the topics of greatest interest and topicality in the field of skull base surgery.

We have accepted the responsibility and commitment to organize this congress, taking care of every detail and motivated to design a scientific program of maximum interest, with national and international guests of maximum recognition, being open to the participation of all interested parties by presenting communications

We have set the goal of holding a congress in which the goal is the learning of skull-based surgeons, with content aimed primarily at the unification of knowledge among different specialists in this field, with the support of numerous contributions and renowned experts and supported by an important audiovisual support that makes the sessions especially educational and intuitive.

From Alicante, the city chosen as the venue for the meeting, we encourage all professionals related to skull base surgery to participate in this experience and to share some pleasant days with us.

Finally, we want to thank the board of our society (SEBAC), the societies of each specialty, SENEC, SEORL, SECOM and also the Formedika Technical Secretariat for their invaluable help and support for the realization of this congress.

A warm greeting.

Pterional Transzygomatic approach

Pterional Transzygomatic approach

This approach allows wide access to different topographic areas (clinoid process region and clinoidal ICA, the entire cavernous sinus (CS), and the posterior fossa from the interpeduncular fossa to the facial nerve) via a lateral trajectory 1).

see Pretemporal transzygomatic transcavernous approach

see Transzygomatic approach with anteriorly limited inferior temporal gyrectomy.

Videos

Position

The patient is positioned in the supine position with the head attached to the table with a Mayfield skull clamp. The head is elevated and left parallel to the ground plane.

Incision

The incision starts at the level of the lower edge of the zygomatic arch, slightly anterior to the tragus, and extends behind the hairline towards the contralateral pupillary line. In patients with thick subcutaneous tissue, a preauricular incision can be extended downwards quite safely, up to 25 mm below the superior edge of the zygomatic arch.

The anteroposterior position of the incision will depend upon the type and location of the lesion to be treated.

Dissection of the soft tissues

The dissection of soft tissues starts with subgaleal disection until the fatty tissue over the temporal aponeurosis is recognized. This sector roughly corresponds to the anterior fourth of the temporal muscle and is located immediately posterior to the frontal branch of the superficial temporal artery. From there, an incision is made on the external layer of the temporal fascia which, together with the interfascial fat, is dissected anteriorly in that plane to protect the frontal branch of the facial nerve. In this inter- fascial space runs a small vein, perpendicular to the incision, which must be coagulated and cut. Afterwards, the orbital rim is exposed at the top of the field, with the zygomatic arch lying below.

Sectioning of the zygomatic arch

The zygomatic arch is sectioned with two vertical cuts: a posterior cut immediately before the temporo–mandibular joint; and an anterior cut just behind the union of the zygomatic arch and zygomatic bone. Thus, the zygomatic arch is moved downwards, together with the masseter muscle.

The temporal muscle is separated from the skull via retrograde dissection, so as to avoid post-operative muscular atrophy.

A small cuff of muscle and fascia, at the level of the superior temporal line, is kept in place for reinsertion of this muscle at the end of surgery. Thus, the muscle is taken downwards, through the space left by the sectioned zygomatic arch. This procedure allows for complete exposure of the floor of the middle fossa.

Craniotomy

A pterional approach (fronto–temporo–sphenoidal craniotomy) is performed in the usual way 2) 3).

The quantity of frontal and temporal bone to be removed depends upon the type and location of the lesion to be resected. The greater wing of the sphenoid bone and the squamous portion of the temporal bone are drilled out until complete exposure of the lateral aspect of the temporal dura is achieved.


Two burr holes are made in the pterion above and below the lower wing of the sphenoid bone and the bone between them is flattened with a burr. A frontotemporal bone flap is cut with a vertical saw that includes the temporal muscle cuff. An additional hole below the upper temporal line may be helpful for this purpose. A free bone flap is lifted elevating and breaking down the bone. In the event of tumors that infiltrate the pterional bone or the external third of the sphenoid wing, it may be necessary to make the craniotomy around the involved bone, which is then removed by drilling or with a bone gouge. This is a pathological bone with reactive hyperostosis and/or tumor infiltration that must be removed, sometimes with profuse vascularization.

Possibilities

The transzygomatic approach offers excellent exposure to the floor of the middle fossa and the lateral wall of the cavernous sinus (both intradurally and extradurally). Also, combined with a pretemporal approach, it affords a good view of the interpeduncular cistern; and using a transtemporal approach, it provides good access to the insular region.

Once the craniotomy has been performed, the anatomical possibilities are numerous:

1.- intradural access to the middle fossa

2.- intradural pretemporal access to the basal cisterns

3.- intradural transtemporal access to the insular region

4.- extradural access to the middle fossa 4).

Case series

José M González-Darder in 2019 presented a prospective series of 26 cases with SWMs larger than 3 cm in one of its main diameter. All patients were studied following the same clinical and imaging procedures. The surgical approach was through a pterional transzygomatic craniotomy. The surgical procedure has the following steps: 1. Extradural tumor devascularization and resection of the hyperostotic and/or infiltrated bone and then intradurally; 2. Intradural tumor debunking; 3. Microdissection of vascular branches and perforators from the capsule; 4. Identification of the optic and oculomotor nerves and internal carotid artery; 5. Tumor capsule dissection and resection; 6. Dural resection or cauterization; 7. Dural and bone reconstruction and closing. Results  All lesions were completely removed. Most complications were transient. The most relevant complication was a large middle cerebral artery infarct with permanent hemiplegia despite a decompressive craniotomy. Conclusion  Large SWMs can be considered as a single pathology regarding the surgical approach and intraoperative microsurgical procedure strategies. The pterional transzygomatic approach allows an extradural devascularization of the tumor and an extensive bone resection that facilitates the intradural stage of tumor resection. The proposed approach allows a wide and radical resection of the duramater and bone that increases the Simpson grade. However, surgery does not control other biological or molecular prognostic factors involved in tumor recurrence 5).


José M González-Darder et al. presented the experience with the transzygomatic pterional approach in the treatment of neurosurgical pathology of the base of the skull located in the middle cranial fossa and surrounding areas.

A retrospective study of pathological findings, surgical outcomes and complications in a series of 31 cases operated on between 2009 and 2011 using a transzygomatic pterional approach.

The lesions involved the sphenoid wing (25.9%), several regions due to invasive growth pattern (19.5%), the temporal lobe (16.1%) and cavernous sinus (12.9%). The others were located in the floor of the middle fossa, Meckel’s cave, incisural space, cisterns, and infratemporal region. The pathological nature of the lesions was: benign meningioma (42%), temporal lobe tumour (19.5%), vascular disease (12.9%), inflammatory lesions (6.4%), atypical meningioma (6.4%), epidermoid cyst (6.4%), neurinoma (3.2%) and poorly differentiated infratemporal carcinoma (3.2%). The approach was usually combined extra-intradural (58.1%) and, less frequently, just extradural (16.1%) or intradural (25.8%). Approach-related complications were minor: haematomas in the wound not requiring treatment (67.8%), superior transient facial paresis (9.7%), transient temporomandibular joint dysfunction (12.9%) and atrophy of the temporal muscle (16.2%). There were no hardware-related complications or cosmetic issues related to the osteotomy and posterior osteosynthesis of the zygomatic arch.

The pterional approach combined with osteotomy of the zygomatic arch allows mobilising the temporalis muscle away from the temporal fossa, consequently exposing its entire surface to complete the temporal craniotomy up to the middle fossa; it helps to access and treat pathology in this region or it can be used as a corridor to approach surrounding areas 6).

References

1)

Chotai S, Kshettry VR, Petrak A, Ammirati M. Lateral transzygomatic middle fossa approach and its extensions: Surgical technique and 3D anatomy. Clin Neurol Neurosurg. 2014 Dec 29;130C:33-41. doi: 10.1016/j.clineuro.2014.12.014. [Epub ahead of print] PubMed PMID: 25576883.
2)

González-Darder JM, Quilis-Quesada V, Botella-Maciá L. [Transzygomatic pterional approach. Part 2: Surgical experience in the management of skull base pathology]. Neurocirugia (Astur) 2012; 23(03):96–103
3)

Quilis-Quesada V, Botella-Maciá L, González-Darder JM. [Transzygomatic pterional approach. Part 1: anatomical study]. Neurocirugia (Astur) 2012;23(02):47–53
4)

Campero A, Campero AA, Socolovsky M, Martins C, Yasuda A, Basso A, Rhoton A. The transzygomatic approach. J Clin Neurosci. 2010 Nov;17(11):1428-33. doi: 10.1016/j.jocn.2010.03.023. Epub 2010 Aug 6. Review. PubMed PMID: 20692168.
5)

González-Darder JM. Combined Extradural and Intradural Pterional Transzygomatic Approach to Large Sphenoid Wing Meningiomas. Operative Technique and Surgical Results. J Neurol Surg B Skull Base. 2019 Jun;80(3):244-251. doi: 10.1055/s-0038-1668538. Epub 2018 Aug 21. PubMed PMID: 31143566; PubMed Central PMCID: PMC6534744.
6)

González-Darder JM, Quilis-Quesada V, Botella-Maciá L. [Transzygomatic pterional approach. Part 2: Surgical experience in the management of skull base pathology]. Neurocirugia (Astur). 2012 May;23(3):96-103. doi: 10.1016/j.neucir.2012.04.005. Epub 2012 May 19. Spanish. PubMed PMID: 22613467.
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