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Letter to the Editor
The use of botulinum toxin type A in nervus intermedius neuralgia
Toxina botulínica tipo A en la neuralgia del nervio intermediario
A. Erdocia-Goñi
Corresponding author
erdociagoniamaia@gmail.com

Corresponding author.
, I. Hernando de la Bárcena
Servicio de Neurología, Hospital San Pedro, Logroño, La Rioja, Spain
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    "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">Nervus intermedius neuralgia is a rare cause of facial and ear pain consisting of recurrent&#44; short-lasting paroxysms of severe pain in the external auditory canal&#44; auricula&#44; and mastoid process&#44; occasionally radiating to the temporoparietal region or the angle of the mandible&#46; The condition may be accompanied by tearing and alterations in taste and salivation&#46;<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a> Diagnosis is clinical&#44; and can be challenging due to the location of the pain &#40;which is similar to that of other neuralgias&#41; and the occasional presence of such symptoms as tearing&#44; which also occur in other headache disorders&#46; Brain MRI helps to detect neurovascular compression and to rule out underlying processes that may cause neuralgia&#46; Few studies have addressed the management of nervus intermedius neuralgia&#59; pharmacological treatment constitutes the first line of treatment&#44; followed by surgery &#40;microvascular decompression or transection of the nervus intermedius and&#47;or the geniculate ganglion&#41; in refractory cases&#46;<a class="elsevierStyleCrossRefs" href="#bib0010"><span class="elsevierStyleSup">2&#44;3</span></a> No cases have been reported of the use of botulinum toxin to treat this entity&#46; We describe the case of a patient with nervus intermedius neuralgia refractory to pharmacological treatment that was successfully managed with botulinum toxin&#46;</p><p id="par0010" class="elsevierStylePara elsevierViewall">Our patient was a 43-year-old woman with 10-year history of idiopathic nervus intermedius neuralgia&#46; She had received carbamazepine&#44; pregabalin&#44; lamotrigine&#44; lacosamide&#44; duloxetine&#44; and nortriptyline at therapeutic doses&#44; showing no response&#46; She experienced 14-16 episodes per month of severe pain associated with a sensation of heat&#59; episodes lasted several seconds and started deep inside the right external auditory canal&#44; radiating to the mastoid process&#46; Pain was sometimes triggered by touch in the periauricular area and was spontaneous on other occasions&#46; The patient occasionally presented tearing&#46; The neurological examination detected no alterations&#46; A brain MRI study &#40;3T scanner&#41; revealed neurovascular compression involving the right glossopharyngeal nerve and the anterior inferior cerebellar artery &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#46; The patient was diagnosed with idiopathic nervus intermedius neuralgia refractory to pharmacological treatment&#46; We administered 50 IU of botulinum toxin type A &#40;10 injection points&#44; 5 IU per injection point&#41; in the territory of the posterior auricular nerve &#40;a branch of the facial nerve&#41;&#46; She presented complete&#44; sustained response for over 3 months&#44; requiring no pharmacological treatment during that period&#46; Pain reappeared after 3 months&#44; and the patient again underwent botulinum toxin infiltration&#44; again showing complete response&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0015" class="elsevierStylePara elsevierViewall">The MRI evidence of compression of the right glossopharyngeal nerve by the anterior inferior cerebellar artery was both a useful finding and a confounding factor&#44; since the pain distribution and radiation observed in our patient are not typical of glossopharyngeal neuralgia but are typical of nervus intermedius neuralgia&#46; Despite the value of brain MRI for the aetiological diagnosis of craniofacial neuralgias&#44; the results should be interpreted with caution&#44; as the diagnosis of these conditions is clinical&#46;<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a> The associated symptoms &#40;tearing in our patient&#41; and the territory of radiation help in establishing a diagnosis&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">Although botulinum toxin type A is known to be useful for treating such other neuralgias as trigeminal neuralgia&#44;<a class="elsevierStyleCrossRefs" href="#bib0020"><span class="elsevierStyleSup">4&#44;5</span></a> there is no published evidence of its use for nervus intermedius neuralgia&#46; In the case of trigeminal neuralgia&#44; the drug is thought to act on neurogenic inflammatory mediators and to mediate neurotransmitter release in sensory and autonomic nerve endings involved in pain&#46;<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">5</span></a> The same action mechanism may be involved in patients with nervus intermedius neuralgia&#46; We wished to share our experience with botulinum toxin type A in this patient&#44; since this treatment may be an intermediate step before resorting to surgery&#46; Descriptive&#44; analytical studies including larger samples should be conducted to evaluate the effectiveness and administration parameters &#40;site&#44; dose&#44; and frequency of infiltration&#41; of botulinum toxin for the treatment of nervus intermedius neuralgia&#46;</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Funding</span><p id="par0025" class="elsevierStylePara elsevierViewall">This study has received no funding of any kind&#46;</p></span></span>"
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Article information
ISSN: 21735808
Original language: English
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es en pt

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