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LETTERS TO THE EDITOR
Year : 2021  |  Volume : 24  |  Issue : 1  |  Page : 106-107
 

Arteriovenous malformation and hemifacial spasm: A rare presentation


1 Undergraduate, Osmania Medical College, Hyderabad, Telangana, India
2 Department of Neurology, Osmania Medical College, Hyderabad, Telangana, India

Date of Submission15-Mar-2020
Date of Acceptance31-Mar-2020
Date of Web Publication24-Jun-2020

Correspondence Address:
Dr. Nihas R Mateti
#401, Srinikethan Apartments, Shyam Karan Road, Ameerpet, Hyderabad - 500 016, Telangana
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/aian.AIAN_173_20

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How to cite this article:
Mateti NR, Thatikala A, Rangalakshmi GS. Arteriovenous malformation and hemifacial spasm: A rare presentation. Ann Indian Acad Neurol 2021;24:106-7

How to cite this URL:
Mateti NR, Thatikala A, Rangalakshmi GS. Arteriovenous malformation and hemifacial spasm: A rare presentation. Ann Indian Acad Neurol [serial online] 2021 [cited 2021 Apr 12];24:106-7. Available from: https://www.annalsofian.org/text.asp?2021/24/1/106/289308




Sir,

Arteriovenous malformation (AVM) is a non-inherited congenital vascular abnormality, with arterial and venous shunts. It is a tangle of blood vessels in the brain which bypasses blood from normal tissues causing venous ischemia locally. AVM detection rate is 1.21/100,000 person-years (95% confidence interval [CI] 1.02–1.42).[1] The usual presentation of AVMs includes headache, bleeding, and stroke. Its association with hemifacial spasm is very rare. To date, less than 50 cases of posterior fossa AVMs presenting as hemifacial spasm have been reported in the literature.[2],[3]

A 45-year-old male presented with hemifacial spasms involving the right side for 5 years duration. The general examination was unremarkable except for the right hemifacial spasm. Nervous system examination revealed Normal cognition, normal language, and speech. Cranial nerve examination was unremarkable except for right hemifacial spasms. There was grade-I spasticity in the right upper and lower limbs. Power was 4/5 in all limbs. Deep tendon reflexes were brisk in both limbs. There was bilateral extensor plantar response. The rest of the nervous system examination was unremarkable.

Magnetic resonance imaging of the brain revealed multiple flow voids at the level of the brain stem extending into the spinal cord [As shown in [Figure 1]a and [Figure 1]b].
Figure 1: (a) T1-weighted (T1W) images showing multiple flow voids at the level of medulla extending into the foramen magnum. (b) T2W images showing multiple flow voids at the level of pons and right side of the prepontine cistern

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CT angiography revealed multiple arterial feeders from vertebral, basilar and superior cerebellar arteries with drainage into anterior pontomedullary, anterior pontomesencephalic, and petrosal veins [As shown in [Figure 2]].
Figure 2: CT angiography revealed a large arteriovenous malformation in the brainstem region extending into the spinal cord with multiple arterial feeders. Spetzler and Martin grade 6 (Inoperable)

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The present case is unusual in the association of hemifacial spasms with Posterior fossa AVM. Posterior fossa AVMs are rare vascular malformations, representing 7–15% of all intracranial AVMs.[4] The mean age of presentation of intracranial AVMs is 32.8 ± 15.0 years. In posterior fossa AVMs, the mean age is 42 years. Brainstem AVMs present even earlier, with a mean age of 32 years. Men and women seem to be equally affected.

Posterior AVMs are usually present with Headaches (13%), Seizures (19%, Focal type in around 30% cases) and Bleeding (62%, 50% being ICHs).[5] Cranial nerve palsies, often affecting trigeminal nerve, and facial nerve, have been associated with lesions in the cerebellopontine angle and brain stem.[6] To date, less than 50 cases of posterior fossa AVMs presenting as hemifacial spasm have been reported in the literature.

Hemifacial spasm (HFS) is characterized by unilateral facial nerve dysfunction presenting as intermittent painless, involuntary and spasmodic contractions of muscles. Wilson[3] introduced the subject of hemifacial spasm as follows: “Facial spasm may be cryptogenic or symptomatic, non- or postparalytic, uni- or bilateral, partial or total, tonic, clonic, tonic-clonic, or fibrillary. Common though it is, both causation and pathogenesis are obscure, while pathological data are scanty and ambiguous.”

Two hypotheses[7] have been proposed to explain the characteristic signs—spasm and synkinesis—of hemifacial spasms. According to the first hypothesis, the development of crosstalk between individual nerve fibers of the facial nerve at the location of the vascular compression leads to aberrant neural transmission, causing the spasms in patients with HFS. While the other hypothesis claims that spasms are a result of hyperactivity of the facial motor nucleus, that is developed as a result of the vascular compression (or irritation) of the root of the facial nerve.

Digre et al.,[8] after reviewing the literature, reported on the etiology of HFS. The most common cause was Vascular abnormalities (either by an artery [loop, aneurysm, malformation, etc], a vein, or both.), Tumors, Bony abnormalities, Trauma, and Demyelinating diseases.

Differential diagnosis of HFS relies on clinical examination. “Babinski 2 sign or other Babinski sign or brow-lift sign” is an important sign in diagnosing HFS. It is the simultaneous contraction of Orbicularis oculi and Frontalis during ipsilateral eye closure causing the eyebrow to move in the upward direction. This cannot be produced voluntarily. The data demonstrated a high prevalence (86%), high specificity (100%), and high interrater reliability (92%).[9]

Treating the underlying cause is found to be a reliable treatment in HFS. Symptomatic management includes using Botulinum toxin injection, Carbamazepine, Gabapentin, Pregabalin. In our case, HFS was managed using Gabapentin as AVM was inoperable.

Declaration of patient consent

The authors certify that they have obtained all appropriate patient consent forms. In the form the patient(s) has/have given his/her/their consent for his/her/their images and other clinical information to be reported in the journal. The patients understand that their names and initials will not be published and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.



 
   References Top

1.
Stapf C, Mohr JP, Pile-Spellman J, Solomon RA, Sacco RL, Connolly E. Epidemiology and natural history of arteriovenous malformations. Neurosurg Focus 2001;11:1-5. Available from: https://thejns.org/focus/view/journals/neurosurg-focus/11/5/foc. 2001.11.5.2.xml. [Last Retrieved on 2020 Mar 08].  Back to cited text no. 1
    
2.
Dou NN, Hua XM, Zhong J, Li ST. A successful treatment of coexistent hemifacial spasm and trigeminal neuralgia caused by a huge cerebral arteriovenous malformation: A case report. J Craniofac Surg 2014;25:907-10.  Back to cited text no. 2
    
3.
Gardner W, Sava GA. Hemifacial spasm—A reversible pathophysiologic state. J Neurosurg 1962;19:240-7. Available from: https://thejns.org/view/journals/j-neurosurg/19/3/article-p240.xml. [Last Retrieved on 2020 Mar 08].  Back to cited text no. 3
    
4.
Almeida JP, Medina R, Tamargo RJ. Management of posterior fossa arteriovenous malformations. Surg Neurol Int 2015;6:31. Available from: https://surgicalneurologyint.com/surgicalint-articles/management-of-posterior-fossa-arteriovenous-malformations/. [Last accessed on 2020 Mar 07].  Back to cited text no. 4
    
5.
Hijazy F, Tjahjadi M, O'shahinan A, Lehto H, Andrade H, Jahromi BR. Surgery of posterior fossa AVM. In: July J, Wahjoepramono E, editors. Neurovascular Surgery. Singapore: Springer; 2019.  Back to cited text no. 5
    
6.
Johnson MC, Salmon JH. Arteriovenous malformation presenting as trigeminal neuralgia. Case report. J Neurosurg 1968;29:287-9.  Back to cited text no. 6
    
7.
Møller AR. Pathophysiology of hemifacial spasm. In: Sindou M, Keravel Y, Møller AR, editors. Hemifacial Spasm. Springer, Vienna; 1997.  Back to cited text no. 7
    
8.
Digre KB, Corbett JJ, Smoker WRK, McKusker S. CT and hemifacial spasm, Neurology 1988;38:1111-3. doi: 10.1212/WNL.38.7.1111.  Back to cited text no. 8
    
9.
Pawlowski M, Gess B, Evers S. The Babinski-2 sign in hemifacial spasm. Mov Disord 2013;28:1298-300.  Back to cited text no. 9
    


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