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May 8th, 2024

Issue #66


Educational Pearl

Temporomandibular Disorders (TMD): TMDs are a group of more than 30 conditions that cause pain and dysfunction in the orofacial joint and muscles that control jaw movement. These disorders are divided into those affecting the masticatory muscles and those affecting the Temporomandibular joint (TMJ) itself. 

TMJ Anatomy: TMJ is a complex joint comprising the glenoid fossa of the temporal bone and the mandibular condyle, separated into two synovial cavities by an articular disc. The upper cavity allows for gliding movements between the disc and the glenoid fossa, while the lower cavity permits rotary or hinge movements between the disc and the condyle. These structural features enable the TMJ to facilitate distinctive movement patterns essential for jaw function. TMJ comprises the mastication muscles – temporalis, masseter, medial and lateral pterygoid – and are stabilized by three major ligaments: the temporomandibular, stylomandibular, and sphenomandibular. TMJ’s primary blood supply comes from superficial temporal and maxillary branches of the external carotid artery. The sensory innervation of the TMJ is provided by the auriculotemporal and masseteric branches of the mandibular nerve (V3), which is a branch of the trigeminal nerve

  • Epidemiology:

    • Affects about 11-12 million people in the United States between the ages 20-44 years

    • Twice as common in women than in men

  • Etiology: is complex and believed to be multifactorial but broadly it is categorized into: disorders of joints (including disc disorders), disorders of muscles used for chewing (masticatory muscles), and headaches associated with TMD.

  • Diagnosis: 

    • There are no diagnostic tests or imaging studies to confirm TMDs, therefore it is of vital importance to obtain a thorough medical and dental history 

    • An emphasis on location, duration, onset, characteristics of pain, aggravating and relieving factors, past treatments, and Hx of other pain disorders should be encouraged

    • Imaging studies (X-ray, MRI, CT) can further help rule out other diagnoses

  • Management & Treatment:

    • Conservative measures help reduce 50-90% of patients symptoms and should be employed first

      • soft diet, moist warm compress, physical therapy and passive stretching exercises, occlusal splints, patient education, and behavior modification

  • Pharmacological therapy includes non-steroidal anti-inflammatory drugs (NSAIDs), muscles relaxants (Cyclobenzaprine), tricyclic antidepressants (amitriptyline), and benzodiazepines (diazepam)

  • Invasive management includes intra-articular corticosteroid, hyaluronic, botulinum toxin injections 

Further Reading:

Temporomandibular Syndrome - StatPearls
Temporomandibular Disorders - NIDCR
Temporomandibular Joint (TMJ) Disorders - Cleveland Clinic

Written by Jenilkumar Patel, Tulane University School of Medicine


Question of the Week

A 47-year-old male presents to the clinic with facial paralysis following surgical resection of a parotid mucoepidermoid carcinoma. Despite undergoing comprehensive rehabilitation, he continues to experience significant functional impairment and facial asymmetry. After discussing treatment options, the patient elects to undergo a gracilis muscle flap procedure for facial reanimation. During the preoperative consultation, the surgeon explains that the gracilis muscle will be transferred to the face and innervated to restore facial movement. Which nerve provides innervation to the gracilis muscle in this procedure?

A) Femoral nerve
B) Sciatic nerve
C) Obturator nerve
D) Tibial nerve
E) Common peroneal nerve

Answer at end of issue

Question by Adriana Baez Berrios, Icahn School of Medicine at Mount Sinai


Facial Plastic and Reconstructive Surgery
Dr. Jacob Dey, MD
Mayo Clinic

Head and Neck Surgery
Dr. Akina Tamaki, MD
University Hospitals-Cleveland Medical Center

Laryngology
Dr. Diana Kirke, MD
Mount Sinai Health

Otology & Neurotology
Dr. Emily Stucken, MD
University of Michigan

Our faculty content reviewers have been instrumental in ensuring that we continue to share high-quality content. We thank them for their contributions to the Auricle!

Pediatric Otolaryngology
Dr. Michele Carr, MD, DDS, MEd, PhD
University of Buffalo, Jacobs School of Medicine and Biomedical Sciences

Rhinology and Sinus Surgery/Medical Student Feature
Dr. Christina Fang, MD
Rush University Medical Center

Sleep Surgery
Dr. Rheena Dhanda Patil, MD
University of Cincinnati


Medical Student Feature Article of The Month:


Tamara Simpson

@Tamara.Simpson23

Rush School of Medicine

Class of 2025

Histopathology of Allergic Fungal Rhinosinusitis Versus Chronic Rhinosinusitis with Nasal Polyps

Simpson T, Talati V, Baird AM, et al. Histopathology of Allergic Fungal Rhinosinusitis Versus Chronic Rhinosinusitis with Nasal Polyps. Laryngoscope. Published online December 10, 2023 [Article Link]

Does the structural histopathology of allergic fungal rhinosinusitis (AFRS) support the classification of AFRS as a subtype of chronic rhinosinusitis with nasal polyps (CRSwNP)? 

Based on immune cell, polyp, and mucin analyses, allergic fungal rhinosinusitis (AFRS) is currently considered a subset of eosinophilic chronic rhinosinusitis with nasal polyps (eCRSwNP). However, whether AFRS is truly a subtype of CRSwNP or whether it is a separate condition is still debated. This retrospective review compares the structured histopathology (SHP) of sinonasal tissue from 29 AFRS and 108 CRSwNP patients at a single institution to address this question. Based on the results of the study, significantly greater Charcot-Leyden crystals (17.2% vs. 2.8%; p = 0.003) and fungal elements (41.4% vs. 10.2%; p < 0.001) were present in AFRS compared to CRSwNP patients. Additionally, while ARFS patients had 12-17% higher frequencies of severe inflammation, subepithelial edema, basement membrane thickening, eosinophil aggregates and predominance (p>0.05), the rates of neutrophil infiltrates, metaplasia, mucosal ulceration, and fibrosis were low and consistent between groups. Overall symptom severity scores were also uniform between the two groups. In conclusion, structural histopathology supported the classification of AFRS as a subtype of CRSwNP, rather than a separate medical condition

Summary written by Suma Alzouhayli, Wayne State University


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Facial Plastic and Reconstructive Surgery

Development and Validation of the Facial Line Distress Scale for Lateral Canthal Lines

Choi K, Kang D, Kang E, Kim S, Lee W, Cho J. Development and Validation of the Facial Line Distress Scale for Lateral Canthal Lines: FINE-LCL. Facial Plast Surg Aesthet Med. Published online April 3, 2024. [Article Link]



The Fine Print About The Fine Lines 

Because the eyes greatly influence the perception of age, the severity of the lateral canthal lines (LCL) has a direct relationship with the process of aging. A cross-sectional study was conducted of 215 patients at a tertiary hospital and two local clinics in Korea between April 18 and June 17, 2022. A 20-question questionnaire, the Facial Line Distress Scale for LCL (FINE-LCL) was created and validated with a focus group of 5 patients. The FINE-LCL was moderately correlated with the appearance appraisal score and body image. Analysis of the accuracy of the FINE-LCL score in predicting the severity of LCL achieved an area under the curve of 0.79. The authors conclude that the FINE-LCL is a reliable and valid patient-reported outcome measure for measuring the severity and burden of LCL. This questionnaire has potential utility not only for screening but also for evaluating the efficacy of treatments for LCL, as it considers the important factor of capturing the patient’s perspective. 


Summary written by Emily Evangelista, University of South Florida Morsani College of Medicine


Head and Neck Surgery

Trends in Oral Tongue Cancer Incidence in the US

Burus T, Damgacioglu H, Huang B, et al. Trends in Oral Tongue Cancer Incidence in the US. JAMA Otolaryngol Head Neck Surg. Published online April 04, 2024. [Article Link]

What are recent trends in oral tongue cancer?

This study investigates recent trends in oral tongue cancer (OTC) rates in the US, with a specific focus on non-Hispanic White women under 50 years old. With OTC rates increasing among young non-smokers, the study aims to determine if this trend continues and if there are variances between early-onset (under 50 years old) and late-onset OTC. Data from 2001 to 2019, utilizing the US Cancer Statistics Public Use Database, shows that while rates among younger women are stabilizing, rates among older women are rapidly rising. This is likely due to a birth cohort effect, which is when distributions of disease arise from exposure effects between different age groups. The examination encompasses various demographic factors, tumor characteristics, and temporal patterns. Findings reveal a notable rise in OTC incidence among non-Hispanic White women aged 50 to 59, surpassing rates in women less than 50 years old. Furthermore, a birth cohort analysis indicates a change in incidence trends among women born post-1980. Predictive models anticipate a significant rise in OTC cases, particularly among older individuals, by 2030-2034. The study emphasizes the necessity for increased awareness and screening among older non-Hispanic White populations, hinting at a potential need to reevaluate OTC risk factors and treatment strategies.

Summary written by Deepthi Akeela, University of the Incarnate Word School of Osteopathic Medicine


Laryngology

Oncological and Functional Outcomes in T3 and T4 Laryngeal Cancer Patients

Nobacht A, Meijer TWH, Oosting SF, et al. Oncological and functional outcomes in T3 and T4 laryngeal cancer patients: choice for larynx preservation or total laryngectomy based on expected laryngeal function. J Laryngol Otol. Published online January 18, 2024. [Article Link]

Is one treatment modality better than the other?

Locally advanced laryngeal carcinomas may be treated with chemoradiotherapy (CRT) or radiotherapy (RT) to preserve laryngeal function. However, laryngeal carcinomas that present with dysphagia or evidence of airway obstruction should be treated with total laryngectomy (TL). This retrospective study aimed to determine oncological and functional outcomes in T3 and T4 laryngeal cancer patients where treatment was guided by expected laryngeal function rather than tumor classification. The study included 189 patients, 130 (69%) with T3 tumors and 59 (31%) with T4 tumors. After a 5-year follow-up, there were no significant differences in disease-specific survival rates (83% for RT, 78% for CRT, 69% for TL, p=.387) or overall survival rates (62% for RT, 54% for CRT, 60% for TL, p=.748) between treatment groups. Larynx preservation rates, as measured by the start of the first therapy until local recurrence or total laryngectomy, were also similar in CRT (86%) and RT (79%) treated patients. CRT, RT, and TL provide comparable survival rates in T3 and T4 laryngeal cancer patients, and functional outcomes do not differ between larynx preservation treatments.

Summary written by Erin Gawel, Jacobs School of Medicine and Biomedical Sciences


Otology and Neurotology Surgery

Pronounced Olfactory Habituation with Age

Hintschich CA, Ma C, Hähner A, Hummel T. Pronounced Olfactory Habituation with Age. Laryngoscope. Published online April 10, 2024.[Article Link]

Sniffing out changing smell patterns


As individuals age, it is believed that there may be a decline in olfactory function. Olfactory habituation, defined as a temporary decrease in olfactory sensitivity due to prolonged exposure to various odors, has garnered attention from researchers aiming to understand changes in olfactory function over time. In a prospective study conducted in Germany, researchers explored the relationship between age and olfactory habituation by selecting 80 participants from both young and old age groups to complete an odor exposure test. The study aimed to assess participants’ ability to habituate to prolonged odors. Using the "Sniffin’ Sticks" test, individual olfactory thresholds for the rose-like odorant phenylethyl alcohol were measured in both nostrils, while a nasal clip delivered continuous odor for varying durations. Overall, this study determined that older adults experience more pronounced ipsilateral nose habituation when subjected to extended odor exposure compared to younger adults (p=0.053). The authors suggest that the stress placed on the olfactory system following exposure to odorants correlates with diminished functionality of the aging sense of smell.

Summary written by Ashwini Sarathy, University of Vermont Larner College of Medicine


Pediatric Otolaryngology

Comparison of Tympanostomy Tubes Under Local Anesthesia Versus General Anesthesia for Children

Fournier I, Caron C, McMurtry CM, et al. Comparison of Tympanostomy Tubes Under Local Anesthesia Versus General Anesthesia for Children. Laryngoscope. 2024;134(5):2422-2429. [Article Link]

Should children undergo tympanostomy tube insertion under local or general anesthesia?

Tympanostomy tube insertion (TTI), commonly used to treat chronic and recurrent ear infections in children, is a procedure traditionally done under general anesthesia (GA). In 2019, the American Academy of Otolaryngology – Head and Neck Surgery released a statement supporting the use of local anesthesia (LA) in clinics for appropriately selected patients, though research on selecting optimal candidates remains limited. This prospective study compared children's pain experiences and parental satisfaction between TTI under LA and GA, with 50 children in each group. Standardized pain scales (Face, Legs, Activity, Cry, Consolability Scale [FLACC] and Children’s Hospital of Eastern Ontario Pain Scale [CHEOPS]) revealed significantly higher pain and distress levels in the LA group at all procedural stages and at the end of the procedure (all p < 0.01). However, rates of minor complications, improvements in quality of life, parental satisfaction post-procedure, and pain one week after surgery, were similar in both groups (all p > 0.05). Despite similar outcomes and parental satisfaction with both anesthesia methods, these findings highlight the critical need for effective pain management strategies in LA use for pediatric TTI.

Summary written by Jonathan Carnino, Boston University Chobanian and Avedisian School of Medicine


Rhinology and Sinus Surgery

Recurrence Morbidity of Olfactory Neuroblastoma

Melder K, Mace JC, Choby G, et al. Recurrence morbidity of olfactory neuroblastoma. Int Forum Allergy Rhinol. Published online April 3, 2024. [Article link]


The Return of Olfactory Neuroblastoma

Olfactory neuroblastoma (ONB) is a rare malignancy of the olfactory epithelium with high survival rates yet high recurrence rates. However, current literature on recurrence patterns of ONB is sparse, necessitating further investigation into prognosis, overall survival (OS), and disease-specific survival (DSS) of recurrent ONB. This retrospective study identified a cohort of 233 patients from February 2005 to April 2021 at nine academic referral centers. Cancer staging, diagnostic imaging, recurrence rates, recurrence sites, time to recurrence, and survival estimates were primary outcomes of interest. When recurrent cases of ONB were compared to a cohort without recurrent ONB, recurrent cases had significantly different cancer stages (p < .001), different imaging characteristics, greater dural involvement and positive margins, and worse DSS with a better DSS in those who had local or neck recurrence compared to those with intracranial or distant recurrence. The results of this study indicate that recurrence of ONB may be associated with a worse prognosis, especially in those with intracranial or distant recurrence. Understanding the specific clinical characteristics that distinguish ONB from recurrent ONB is important for surveilling patients with ONB and patient counseling.

Summary written by Emaan Dawood, Virginia Commonwealth University School of Medicine


Sleep Surgery

Laryngeal Hyposensitivity in Obstructive Sleep Apnea

Callander JK, Kandahari N, Strohl MP, Cheung SW, Chang JL. Laryngeal Hyposensitivity in Obstructive Sleep Apnea. Laryngoscope. Published online March 30, 2024. [Article Link]


Is laryngeal sensitivity diminished in obstructive sleep apnea?

Impaired laryngeal sensation has been thought to play an important role in the pathophysiology of obstructive sleep apnea (OSA) through mechanical inflammation via repetitive collapse of the vocal cords. 38 subjects were enrolled in this study from a tertiary care sleep surgery clinic divided into controls (N=12) without OSA, and the study subjects with OSA (N=26). Endoscopy-directed laryngeal sensation testing was performed by stimulating the medial aryepiglottic fold or arytenoid using Cheung-Bearelly monofilaments after anesthetizing the nasal cavity. Video analysis evaluated the latency time from initial stimulation to response of vocal fold adduction - the laryngeal adductor reflex (LAR). The OSA group had significantly reduced LAR full response rates (32.5% vs. 75.4%, p < 0.001), as well as combined full and partial response rates (50.3% vs 87.1, p < 0.001) when compared to the control group upon monofilament stimuli (32.5% vs. 75.4%, p < 0.001). The OSA group also exhibited a shorter mean latency period for full LAR response, which was positively correlated with OSA disease severity (p = 0.011) based on the apnea-hypopnea index. The study author suggests that alterations to the LAR could be due to decreased somatosensory receptor sensitivity, increased sympathetic tone, and reorganized brain stem function in OSA patients.

Katelin Keenehan’s Takeaway: The control group in this study was screened for OSA, but had not undergone sleep study testing before participating. Further research with controls who have undergone a sleep study may strengthen these results and provide a basis for additional research to treat OSA based on its pathophysiological cause.


Question of the Week Answer

Correct Answer: B

Explanation:
Respiratory papillomatosis is most commonly caused by HPV virus strains 6 and 11. HPV strains 16 and 18 have higher malignant potential but are less commonly associated. HHV 4 is the Epstein-Barr virus, which is associated with nasopharyngeal carcinoma. HHV 8 is Kaposi Sarcoma, a vascular tumor that may present in the head and neck but is commonly seen in immunocompromised individuals. Molluscum Contagiosum Virus can cause raised umbilicated lesions, although it is not directly related to respiratory papillomatosis. 

Reference:
Bachir S, Shah S, Shapiro S, et al. Neurofibromatosis Type 2 (NF2) and the Implications for Vestibular Schwannoma and Meningioma Pathogenesis. Int J Mol Sci. 2021;22(2):690. Published 2021 Jan 12. Available from: [Article Link


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