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A Case Report of Complex Auricular Neuralgia Treated with the Great Auricular Nerve and Facet Blocks

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A Case Report of Complex Auricular Neuralgia Treated with the Great Auricular Nerve and Facet Blocks Journal name: Journal of Pain Research Article Designation: CASE REPORT Year: 2017 Volume: 10 Journal of Pain Research Dovepress Running head verso: Eghtesadi et al Running head recto: Complex auricular neuralgia treated with GAN and facet blocks open access to scientific and medical research DOI: http://dx.doi.org/10.2147/JPR.S126923 Open Access Full Text Article CASE REPORT A case report of complex auricular neuralgia treated with the great auricular nerve and facet blocks Marzieh Eghtesadi1 Background: The great auricular nerve is a cutaneous branch of the cervical plexus originating Elizabeth Leroux2 from the C2 and C3 spinal nerves. It innervates the skin over the external ear, the angle of the Grisell Vargas-Schaffer3 mandible and the parotid gland. It communicates with the ansa cervicalis. Great auricular neu- ralgia is rarely diagnosed in clinical practice and can be refractory. We present a new approach 1Department of Pain Clinic, Headache Management, Centre Hospitalier de using ultrasound-guided nerve blocks. l’Université de Montréal (CHUM), Centre Case: We present a case of a 41-year-old female with paroxysmal ear pain accompanied by de Recherche de l’Université de Montréal (CRCHUM), 2Department of General dysautonomia, tingling in the tongue, dysphagia, dysarthria and abdominal symptoms. No Neurology, Headache Management, significant findings were found on cervical and brain imaging. The patient responded partially Centre Hospitalier de l’Université de Montréal (CHUM), Centre de Recherche to a great auricular nerve block. A combined approach using this block with facet block of C2 de l’Université de Montréal (CRCHUM), and C3 induced a more pronounced and prolonged benefit. 3Department of Anesthesiology, Pain Clinic, Centre Hospitalier de l’Université Conclusion: Great auricular neuralgia is not often encountered in practice and can be accom- de Montréal (CHUM), Centre de panied by symptoms originating from the ansa cervicalis network. A combined approach of Recherche de l’Université de Montréal nerve blocks can be considered in refractory cases. (CRCHUM), Montreal, QC, Canada Keywords: ansa cervicalis, neuropathic pain, facet block, red ear syndrome, great auricular nerve Video abstract Introduction The great auricular nerve (GAN) is a cutaneous branch of the cervical plexus originat- ing from the C2 and C3 spinal nerves.1 It innervates the skin over the external ear, the angle of the mandible and the parotid gland.2 Here, we present a case of unusual ear pain with dysautonomia and gastrointestinal manifestations. The patient was refractory to usual neuropathic pain pharmacotherapy. Great auricular neuralgia is a rare condition. It can be associated with symptoms linked to the cervical plexus. Treatment may include a combination of peripheral nerve blocks targeting the GAN itself and the C2–C3 cervical roots. Point your SmartPhone at the code above. If you have a QR code reader the video abstract will appear. Or use: http://youtu.be/bccCtE3DBxE Case presentation The patient is a 41-year-old female who presented with a 1-year history of paroxys- Correspondence: Marzieh Eghtesadi mal left ear pain and tingling sensation in her tongue. The pain in her ear radiated to Department of Pain Clinic, Headache the ipsilateral side of her face as well as posteriorly in the distribution of the lesser Management, Centre Hospitalier de l’Université de Montréal (CHUM), 3840 rue occipital nerve. She reported associated jaw clenching and allodynia to teeth brushing Saint Urbain, Hôpital Hôtel-Dieu du CHUM, and mastication. The pain worsened at the end of the day to a severe intensity, at which Clinique antidouleur 2 étage, Pavillon Jean Mance, Montreal, QC H2W 1T8, Canada time there was red discoloration of the ear. The patient alternated between a constant Tel +1 514 890 8000 dull aching pain at 5 out of 10 and periods of paroxysmal pain reaching 8 out of 10 Fax +1 514 412 7132 Email [email protected] on a numerical rating scale and lasting between 1 and 5 consecutive days. submit your manuscript | www.dovepress.com Journal of Pain Research 2017:10 435–438 435 Dovepress © 2017 Eghtesadi et al. This work is published and licensed by Dove Medical Press Limited. The full terms of this license are available at https://www.dovepress.com/terms. php and incorporate the Creative Commons Attribution – Non Commercial (unported, v3.0) License (http://creativecommons.org/licenses/by-nc/3.0/). By accessing the work http://dx.doi.org/10.2147/JPR.S126923 you hereby accept the Terms. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed. For permission for commercial use of this work, please see paragraphs 4.2 and 5 of our Terms (https://www.dovepress.com/terms.php). Eghtesadi et al Dovepress During exacerbations, the patient also complained of a multiple drug intolerance syndrome, including a probable dysphagia and dysarthria. Other symptoms included post- Stevens–Johnson with carbamazepine. prandial abdominal pain and diarrhea. She was evaluated by an allergist. Due to the serious There was a history of sports-related mild traumatic head nature of side effects, all pain medications had been stopped injury as a young adult and a whiplash involving subluxation at least 2 weeks prior to the ultrasound-guided infiltrations of the C4–C5 cervical vertebrae. Past medical history also described below. included mononucleosis, two previous superficial lower A diet at the patient’s own initiative proved slightly suc- extremity venous thromboses postpartum and heterozygous cessful in reducing her postprandial abdominal pains. factor V Leiden thrombophilia. The patient was initially diagnosed with trigeminal Examination of her cranial nerves revealed diffuse neuralgia. The diagnosis was later revised to great auricular hypoesthesia to touch, pinprick and temperature in the left neuralgia, given the distribution of the pain. Additional trigeminal distribution. No intraoral trigger points were iden- symptoms were attributed to a dysfunction at the level of tified. There was decreased sensation to touch and pinprick the ansa cervicalis. in the area of the greater and lesser occipital nerves. The gag We initially performed a GAN block using ultrasound reflex on the left side was absent. Lateral neck flexion to the guidance (Figure 1). We used a GE Logiq e® Ultrasound right was limited with diffuse tenderness on palpation of machine equipped with a 12 MHz high-frequency transducer. the left paracervical muscles. Neck compression testing for The GAN was identified at its emergence from the posterior radiculopathy and facet syndrome using Spurling’s maneuver border of the sternocleidomastoid muscle, at the level of the was able to provoke the patient’s red ear discoloration after cricoid cartilage located by palpation.3,4 Once the hypoechoic a 15-second compression. round shaped nerve was visualized, a 25G, 50 mm needle The patient’s workup included a 3T cerebral angio- was introduced in plane with the ultrasound probe, and we magnetic resonance imaging with contrast, Constructive injected a mix of 1 mL 2% xylocaine, 1 mL 0.5% bupivacaine Interference in Steady State sequence imaging of the circle and 1 mL of triamcinolone (40 mg). This technique proved of Willis and magnetic resonance imaging of the cervical successful in relieving the patient’s paroxysmal earaches for spine. A contact between the superior cerebellar artery and over 1 month with reduction of pain intensity of 60%. The the cisternal portion of the left trigeminal nerve was seen, but patient reported improvement within 48 hours following without evidence of compression. A chest X-ray was normal. nerve block of the GAN. No adverse events were reported. Rheumatological workup showed mildly elevated antinuclear Three months later, the patient’s pain was back at base- antibodies, but was otherwise inconclusive for collagenosis. line. We combined the GAN block with ultrasound-guided Gastrointestinal workup, including food allergy testing, facet blocks of the C2 and C3 spinal nerves as well as lesser gastroscopy and colonoscopy with biopsies were negative. occipital nerve block. We injected 2 mL of the same analgesic Drug trials included acetaminophen, naproxen, tri- mix at each infiltration point. The combination of these blocks cyclic antidepressant, gabapentinoids, carbamazepine, reduced not only the intensity of her paroxysmal ear pain, topical analgesics, bupropion, muscle relaxant, tapentadol, but also the duration of exacerbations from 1 to 5 days to morphine, hydromorphone and methadone. Pharmacotherapy <24 hours and the background pain by >50%. The relief was was unsuccessful in this patient. In addition, she developed more prolonged, lasting for over 2 months. GAN PSCM Figure 1 Ultrasound-guided transverse view of the GAN. Abbreviations: GAN, great auricular nerve; PSCM, posterior border of sternocleidomastoid muscle. 436 submit your manuscript | www.dovepress.com Journal of Pain Research 2017:10 Dovepress Dovepress Complex auricular neuralgia treated with GAN and facet blocks Discussion revealed pain of neuropathic origin as per the Douleur Neu- The GAN arises from the ventral rami of C2–C3 roots, along ropathique 4 questionnaire, but the patient suffered serious with two other sensory branches, the lesser occipital nerve adverse reactions to usual neuropathic pharmacotherapy. and the transverse cervical nerve.5 The fourth cervical cutane- Our nerve blocks targeted the GAN peripherally
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