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A 50-year-old female presented to a chiropractic clinic with left jaw pain consistent with temporomandibular joint disorder. Examination revealed a large ulcerated mass on the posterolateral margin of the tongue which was later diagnosed as squamous cell carcinoma. Squamous cell carcinoma is the most common of the oral cancers. These cancers are often detected late making treatment more complicated and reducing the chance of survival. In the early stages squamous cell carcinoma can be asymptomatic. Symptoms can be similar to that of temporomandibular joint disorder making examination of the patient’s mouth important to rule out oral cancers. Oral cancers should be considered when patients present to a chiropractor with pain in the area of the temporomandibular joint. Risk factors such as chronic tobacco and alcohol use should raise concern in these patients. Suspicious lesions should be referred immediately for further investigation.
Une femme de 50 ans se présente à une clinique chiropratique. Elle souffre de douleur à la mâchoire gauche correspondant à un trouble de l’articulation temporo-mandibulaire. L’examen révèle une grande masse ulcérée sur l’angle postérolatéral de la langue. Cette masse a été diagnostiquée comme étant un carcinome épidermoïde. Ce type de carcinome est la plus fréquente forme de cancer de la bouche. Le traitement du cancer buccal est difficile puisqu’il est souvent diagnostiqué trop tard. Aussi, la chance de survie en est réduite. Au stade précoce, le carcinome épidermoïde peut être asymptomatique. Ses symptômes sont similaires à ceux d’une pathologie de l’articulation temporo-mandibulaire et il est donc primordial de procéder à un examen buccal afin d’éliminer toute possibilité de cancer de la bouche. La possibilité d’un cancer buccal doit être prise en considération lorsqu’un patient se présente à la clinique et qu’il souffre de douleur dans la région de l’articulation temporo-mandibulaire. Les facteurs de risque tels que le tabagisme et l’abus d’alcool doivent être une source de préoccupations pour ce patient. Les lésions suspectes doivent immédiatement être soumises à un examen approfondi.
Temporomandibular joint disorder (TMD) is a condition that presents to a chiropractors office on a somewhat regular basis (1–2 times per month).1 Chiropractors should be expected to do a thorough history and examination when accessing TMD. One of the less common causes of pain in the area of the temporomandibular joint are oral cancers. The most common oral cancer is squamous cell carcinoma.2 These cancers often present in the later stages of the disease where the treatment is more complicated and survival less likely. It is important that any chiropractor treating TMD be aware of oral cancers to help detect them in the early stages of the disease. We present the case of a 50-year-old female patient with squamous cell carcinoma on the posterolateral margin of the tongue who presented with persistent left sided jaw pain consistent with TMD.
A 50-year-old female was referred to a chiropractic office by an ears-nose-throat specialist (ENT) for assessment of a left temporomandibular joint problem secondary to arthritis that was possibly provoked by two assaults over 20 years earlier. At that time, she stated that the jaw pain had started after a bout of the flu. She felt that her jaw pain had been aggravated by coughing. The patient delayed following through with the chiropractic consultation until 6 months later.
She presented to the chiropractic office with left jaw pain that was worsening (10/10 on a numerical rating scale) with radiation to the left ear. The pain was described as continuous and was aggravated by chewing and lying on her left side. She reported having recently broken a lower left molar. Within the last month she had started having difficulty swallowing. She was a chronic smoker (1–2 packs a day) for the last 34 years and a social drinker. There was a history of depression and she was currently taking Zoloft. She had been treated for peripheral vascular disease with vascular surgery being pre-formed on the left inner thigh. She had tested positive for hepatitis B infection. The jaw pain was being managed by acetaminophen.
The patient was a women who appeared older than her stated years. She had poor dental health and was missing several teeth. Examination revealed full cervical range of motion with mild pulling on right lateral flexion. Postural evaluation revealed mild anterior head carriage. Jaw movements aggravated her pain and she was reluctant to open her mouth to the extreme. Palpation of the left temporomandibular joint elicited tenderness although there was more sensitivity to palpation in the submandibular region. The patient became apprehensive on intraoral examination reporting that she had broken a tooth 3 weeks earlier which was irritating her tongue. Upon inspection of the area a large ulcerated mass was observed near the base of the tongue on the left. The mass was 3 to 4 times the thickness of her tongue. When questioned about the mass she related it to her broken tooth. Due to her poor dental health it was difficult to determine whether her tooth was in fact broken. The ENT specialist was immediately called and an appointment booked the following week. The patient was not seen by the chiropractor subsequent to her initial visit. Three days after seeing the ENT specialist a biopsy was performed which was positive for squamous cell (T3) carcinoma at the left posterior oral tongue.
The patient was referred to a regional cancer centre where she was seen 13 days after the biopsy. She was examined by a head-neck surgeon who prescribed pain medication and scheduled her for surgery 14 days later. CT imaging of the head and neck showed lymphadenopathy ipsilateral to the mass which was not palpable on examination. Radiation therapy was recommended after the surgery.
Surgery consisted of a left commando resection via a lower lip splitting incision, two incisions in the left neck, a mandibulectomy and adjacent large glossectomy and reconstruction with a radial forearm osteocutaneous free flap. She was fitted with a percutaneous endoscopic gastrostomy tube.
Two days post surgery the patient had a major myocardial infarction and was transferred to an intensive care unit. She made a slow but full recovery over several weeks. Upon discharge from the hospital she was still on a feeding tube with a weight gain of 3 to 4 pounds. She was able to make verbal sounds but her speech was limited with about 25% of her words being discernable.
Radiation therapy was attempted on this patient. She was unable to lie down as was required. Radiation therapy was postponed until she was able to tolerate lying supine.
The patient was examined by the head-neck surgeon 6 months post surgery. She was continuing to gain weight and had no discomfort or pain. She was still achieving all of her nutrition with a feeding tube. Examination at this time revealed a soft tissue proliferative mass at the junction of the free-flap and remaining left base of the tongue. The patient died within nine months of the recurrence of the intraoral lesion.
Cancer of the oral cavity accounts for only 4% of all cancers, squamous cell carcinoma being the most frequent. Oral cancer is on the rise and worldwide is estimated to be the sixth most common cancer. It is primarily a disease occurring after 45 years of age and is most likely to affect the tongue, lips and floor of the mouth in 90–95% of cases.3,4 Squamous cell carcinoma presents intra-orally as a non-healing ulcer which appears as a white (Figure 1, ,2)2) or red patch.5 Oral cancer is more prevalent in males and is associated with tobacco use in all forms and alcohol drinking.6,5 Most authors agree that either substance alone can induce oral cancers, however, most cases result from a combination of smoking and drinking.3–6
The Canadian Cancer Society along with the National Cancer Institute of Canada publishes yearly statistics on cancer in Canada.7 They have estimated for 2003 that there will be 139,900 new cases of cancer diagnosed and 67,400 deaths that year due to cancer. Oral cancers will account for 3100 of these new diagnoses of which 2100 will be in males and 1000 in females. Deaths due to oral cancers will occur in approximately 730 males and 360 females. The lifetime probability of developing oral cancer is 1:185.2 in males and 1:400 in females. The importance of different types of cancers can be measured with the death to case ratio. In Canada the death to case ratio for oral cancer is .36 which is listed as a fairly good prognosis (a ratio of over .5 being a poor prognosis and under .3 being a good prognosis).
Patients diagnosed with intraoral cancers tend to have unfavourable outcomes when detected in later stages. Examination of the oral cavity can be easily performed and will readily reveal abnormal changes; therefore, early diagnosis should be possible and outcomes for these patients should improve.8 Unfortunately, only 30–40% of patients survive an average of 5 years despite recent surgical advances.7 The short survival time is largely due to late detection and treatment.9,8 Shira8 found that the average time lapse between symptoms and consultation is 4.6 months, while Bruun9 found it to be 4.9 months. Both Bruun and Shira9,8 discovered that it was another 5.6 months before these patients were referred for further examination and treatment.
This delay in diagnosis and treatment of oral cancers can be attributed to three things. First, public awareness of oral cancer is low compared with other forms of cancer; therefore, patients generally ignore early signs and symptoms.6 Second, health professionals like dentists and specialists who routinely diagnose more common complaints of the oral cavity may overlook the risk of a possible malignancy. On the other hand, health professionals not as familiar with diagnosis and treatment of oral complaints realize the need for referral sooner.8 Third, oral squamous cell carcinoma presents in a variety of ways, and most early lesions are asymptomatic.6 One study found that 15% of patients with intraoral squamous cell carcinoma did not exhibit any subjective symptoms even when the tumor was greater than 4 cm in diameter.10 Furthermore, there is usually a lack of “red flag” symptoms such as persistent ulcers and neurologic disturbances.8 According to Bruun and Shira,9,8 the most frequent complaint of oral cancer was swelling followed by pain. These are generally banal complaints and may occur with much more common disorders.9,8
Temporomandibular joint disorder (TMD) refers to a collection of painful symptoms affecting the joint formed by the mandible and the temporal bone of the skull. It has been estimated that approximately 85–90% of the population will show at least one temporomandibular joint (TMJ) symptom in their lifetime. TMD is more common in women but has no predilection for age.11
TMD can be a difficult disorder to diagnose and treat for four reasons. First, it is not a well defined condition. TMD tends to be a multi factorial disorder that includes structural, functional and psychosocial factors.12 TMD may be due to any number of underlying causes. Most commonly it is associated with dysfunction and myofacial pain as a result of teeth clenching, jaw grinding, or repetitive motions like gum chewing. Less common causes include joint disorders like osteoarthrosis, and mechanical problems.13,14 Many authors have suggested that cervical spine dysfunction can give rise to TMD; however, one study using an anamnestic self-administered questionnaire did not support this theory.12,15 Therefore, not only are there a number of causes of TMD but conflicting opinions as to the etiology as well.
Second, it rarely signals a more serious disease.16 The classic presentation of TMD is pain in front of the tragus with radiation to the ear, lower jaw, cheek and temple.14 Interestingly, patients with intraoral malignancies may also present with similar complaints of pain.
Third, TMD presents with a myriad of symptoms. These include acute and/or chronic pain and/or tenderness of the muscles of mastication, facial muscles, and the cervical-thoracic musculature, ear pain with or without radiation to the jaw and cheeks that worsens with chewing, a feeling of fullness in the ear, neck and/or jaw stiffness, ringing in the ear, clicking and popping sounds, malocclusion and worn teeth, mouth and tooth pain especially upon chewing, vertigo, numbness, inadequate jaw opening (less than a 3 finger opening), and headaches that are usually temporal in location.17 With such a wide array of symptoms, disorders of surrounding structures may be easily mistaken as TMD.
Fourth, there is a lack of people seeking intervention for TMD. According to Walling,14 only 5% of adults with TMJ symptoms seek medical help. Hawk and associates18 found that out of those people seeking chiropractic intervention for musculoskeletal conditions (which is the predominant reason for office visits to a chiropractor), only 0.46% were treated for TMJ pain as their chief complaint. Consequently, there is a lack of experience in dealing with TMD. This may lead to an inaccurate diagnosis.
When a patient is suspected of having TMD, the diagnosis is often made by ruling out other conditions. Consequently, a detailed physical history is imperative. It should include a description of the pain and related symptoms as well as information relating to the dental and medical history. This is essential in uncovering any underlying conditions.16 A thorough examination of the temporomandibular joint requires checking the jaw range of motion during opening and closing, palpating the joint for tenderness, clicks or pops, and examining the ear, teeth, mouth, neck, jaw and salivary glands including the surrounding nerves, muscles and soft tissue.16,14 This means looking into the oral cavity and observing any lesions. Since the oral mucosa is easily examined and changes can be readily observed, suspicious lesions should be immediately referred for further evaluation. Only then can the clinician rule out conditions that may mimic TMD.
Unfortunately, a significant number of studies on TMD did not discuss typical differential diagnoses. Only one article was found that discussed neoplasms of the temporomandibular joint that could mimic TMD. No studies were found that mentioned intraoral cancer as a differential diagnosis for TMD. Furthermore, very few studies emphasized the need for intraoral examinations in order to rule out more sinister causes of facial, jaw and ear pain.
Consequently, the difficulty in diagnosing and treating TMD combined with the relatively low prevalence of oral cancers has contributed to a poor understanding of how pain from disorders of the oral cavity can mimic TMD. In turn, this may lead to an inaccurate diagnosis of TMD.
It is essential to understand the neuroanatomy of the head and neck in order to realize how intraoral malignancies can lead to an inaccurate diagnosis of TMD. The principal innervation of the TMJ is the auriculotemporal nerve.19 It is a branch of the posterior trunk of the mandibular nerve which originates from the trigeminal nerve, one of the largest cranial nerves.20 The trigeminal nerve is a mixed nerve (motor and sensory) that provides sensory innervation to the face and mucous membranes of the nasal and oral cavities, and motor innervation to the muscles of mastication.21
The sensory root of the trigeminal nerve exits the pons with the motor root and expands to form the trigeminal ganglion or the gasserian ganglion. At this point it gives rise to three trunks; the ophthalmic, maxillary and mandibular divisions. The mandibular trunk joins the motor root of the trigeminal nerve to form the mandibular nerve. After leaving the skull via the foramen ovale it travels in the infratemporal fossa and divides into four main terminal branches. These are the motor branches, the lingual nerve, the inferior dental branches and the mental branches. The lingual nerve is of interest since it conveys sensation from the anterior 2/3 or oral part (the body) of the tongue and lower gums. The mandibular nerve also supplies the skin of the lower lip, jaw, chin, tympanic membrane, auditory meatus and upper ear.21 Sensory information including noxious stimuli from these structures terminate on the spinal nucleus of the trigeminal nerve within the brainstem. The information is then conveyed to the thalamus (predominantly the ventral posteromedial nuclei) via the trigeminothalamic tract.21 Finally, pain can be consciously appreciated.
The patient’s lesion was located on the left posterior oral tongue; however, her chief complaint was severe left jaw pain with radiation to the left ear. Since the spinal nucleus of the trigeminal nerve receives nociceptive information from the jaw, ear and oral tongue via the mandibular nerve, pain may be perceived in any of these areas when the origin was actually the anterior 2/3 of the tongue.20
Examination of the oral cavity is important in any patient presenting with symptoms of TMD. Chiropractors should perform a thorough history and examination. History is important to elicit risk behaviors, history of head and neck radiotherapy, family history of head and neck cancer and personal history of cancer. The examination should include visual inspection and palpation of the head, neck, oral and pharyngeal regions. Visual inspection should be done with a good light source. Mirrors can be useful in seeing area of the mouth that are difficult to normally see. Palpation should include the nodes of the neck and floor of the mouth and tongue. Protraction of the tongue with gauze can help visualize the posterolateral tongue and tongue base.22
Patients initially suspected of TMD requires a thorough history of the presenting complaint including a recent experience of TMJ pain and /or sudden mandibular restriction. The clinical exam must include TMJ palpation and palpation of the masticatory muscles to duplicate the chief complaint of pain. Joint sounds and mandibular range of motion are secondary signs since they can be asymptomatic. It is vital to examine other systems including adjacent musculoskeletal systems, neurologic, vascular and otolaryngoglic systems to rule out other causes of pain.19
As TMD is continually researched and re-defined, we may find that traditional signs and symptoms like TMJ joint sounds and mandibular restriction will lose their relative importance. Simpler determinants including a history of pain in the muscles of mastication and palpable muscle and joint tenderness will define TMD.19 This way, it may become easier to catch more sinister causes of head/neck/face pain like squamous cell carcinoma of the tongue.
This case study emphasizes the need for health practitioners to perform intraoral exams when investigating any head or neck complaint. Patients with a history of smoking and drinking and who are over 40 years of age should be screened for the possibility of oral cancer. This is especially important for health care providers who routinely deal with more common conditions. Screening for oral cancer is simple since lesions of the oral mucosa are readily visible and at most requires a good light source and a little extra time.5 Health practitioners who encounter patients with a suspicious oral lesion inconsistent with the presenting head/neck/face complaint, must include malignancy as part of their differential diagnosis. Immediate referral to a specialist is warranted so that oral cancer can be detected early. Only then can outcomes for these patients improve.
Oral cancers are not common despite their increasing prevalence but should be made more publically aware as part of a prevention program. Since most cases of oral cancer result from the combined effect of smoking and drinking, tobacco and alcohol abuse cessation programs should be aggressively promoted.20 Chiropractors can direct patients in most provinces to the Canadian Cancer Society smokers’ helpline (1-877-513-5333) and other quitlines for free information, advice and support on smoking sessation.23 Nutritional education may also play a role in prevention. Chiropractors have long understood the relationship of treating the whole person and not just the part that is diseased. Patients with a history of alcohol and tobacco abuse should receive nutritional evaluation and advise. Numerous studies support the hypothesis that beta-carotene and vitamin C have a significant protective effect against oral cancers.13 Therefore, increased consumption of fruits and vegetables in the daily diet is helpful in the prevention of oral cancer. Chiropractors have a unique opportunity to promote health and wellness in their practices and should include improved nutrition as part of their treatment plan. This could make a significant impact for the patients at risk of intraoral malignancies.