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Galvanic lesion of oral cavity — Clinical Guidelines

Overview

Galvanic lesions of the oral cavity, often referred to as mylohyoid boutonnières (MHBs), are anatomical variations characterized by discontinuities in the mylohyoid muscle where soft tissue, such as salivary gland tissue, fat, blood vessels, or lymph nodes, can herniate into the defect. These lesions are clinically significant due to their potential to mimic other oral pathologies, complicating diagnosis and management. They are commonly encountered in routine oral examinations and imaging studies, particularly MRI scans. Understanding and recognizing these lesions is crucial for clinicians to avoid misdiagnosis and inappropriate treatment, ensuring accurate patient care. This knowledge is essential in day-to-day practice for accurate diagnosis and appropriate management of oral cavity lesions. 1

Pathophysiology

The pathophysiology of galvanic lesions, specifically mylohyoid boutonnières, involves congenital or acquired discontinuities within the mylohyoid muscle. These discontinuities arise from developmental anomalies or postnatal injuries that disrupt the continuity of the muscle fibers. The resultant herniation of adjacent soft tissues, predominantly salivary gland tissue and fat, into these defects can lead to localized swelling or masses within the floor of the mouth. While the exact molecular and cellular mechanisms are not extensively detailed in the available literature, the presence of these herniated tissues can influence local tissue dynamics, potentially affecting salivary function and oral anatomy. The anatomical variations are often asymptomatic but can become clinically relevant when they cause functional disturbances or mimic other pathological conditions. 1

Epidemiology

The prevalence of mylohyoid boutonnières is notably high, with studies indicating that these lesions are present in approximately 50.7% of individuals examined via MRI. Bilateral occurrences are observed in nearly 45.6% of cases, suggesting a bilateral tendency. These lesions predominantly affect the anterior and middle thirds of the mylohyoid muscle, with no significant sex predilection noted in the reviewed studies. Age dependence appears minimal, as the prevalence does not markedly vary across different age groups within the studied population. However, broader epidemiological trends and geographic variations are not extensively explored in the current literature, limiting comprehensive insights into risk factors beyond anatomical predisposition. 1

Clinical Presentation

Mylohyoid boutonnières typically present as asymptomatic soft tissue masses or swellings within the floor of the mouth, often discovered incidentally during routine examinations or imaging studies. Clinically, these lesions may appear as localized bulges or irregularities in the mylohyoid muscle region. While most cases are asymptomatic, some patients might report mild discomfort or changes in salivary flow due to the herniated contents. Red-flag features are rare but may include significant pain, rapid growth, or associated systemic symptoms, which would warrant further investigation to rule out more serious pathologies such as malignancies or infections. 1

Diagnosis

The diagnosis of mylohyoid boutonnières primarily relies on imaging techniques, particularly MRI, which offers detailed visualization of the muscle discontinuities and herniated contents. Clinicians should perform a thorough clinical examination followed by imaging studies to confirm the presence and characteristics of these lesions.

Imaging Criteria:

- MRI is the gold standard, identifying discontinuities in the mylohyoid muscle. - Herniated contents typically include salivary tissue (69.3%), fat (15.9%), and occasionally blood vessels or lymph nodes. - Bilateral involvement should be noted, occurring in approximately 45.6% of cases. - Location should be specified, with most defects found in the anterior (45.6%) and middle (51.0%) thirds of the muscle.

Differential Diagnosis:

- Salivary Gland Tumors: Distinguished by more irregular margins and absence of muscle discontinuity on imaging. - Lymphadenopathy: Typically presents with lymphadenoid structures rather than muscle defects. - Infections or Abscesses: Often associated with signs of inflammation, pain, and systemic symptoms not typically seen in MHBs.

Management

Management of mylohyoid boutonnières is generally conservative, focusing on symptomatic relief and reassurance if the lesions are asymptomatic. Surgical intervention is rarely necessary unless complications arise or there is significant functional impairment.

Conservative Management:

- Observation: Regular follow-up imaging to monitor stability and absence of complications. - Patient Education: Inform patients about the benign nature of the lesion and the lack of need for intervention in asymptomatic cases.

Surgical Intervention (Refractory Cases):

- Indications: Significant symptoms, suspected complications (e.g., infection, obstruction). - Procedure: Surgical exploration and potential repair of the muscle defect. - Post-Operative Care: Monitoring for complications, including infection and functional recovery.

Contraindications:

- Active infection or signs of systemic illness. - Presence of other significant oral pathologies requiring immediate attention.

Complications

While mylohyoid boutonnières are generally benign, potential complications include:

Infection: Rare but can occur if there is trauma or disruption of the herniated tissue.

Functional Impairment: Obstruction of salivary ducts or interference with swallowing mechanisms.

Misdiagnosis: Leading to unnecessary aggressive treatments or delays in addressing true pathologies.

Referral to a specialist (oral surgeon or maxillofacial surgeon) is warranted if complications arise or if there is uncertainty in diagnosis and management. 1

Prognosis & Follow-up

The prognosis for patients with mylohyoid boutonnières is generally favorable, with most cases remaining stable over time without intervention. Regular follow-up MRI scans every 6-12 months are recommended to monitor for any changes in lesion characteristics or development of complications. Prognostic indicators include the absence of symptoms and stability in imaging findings over time. 1

Special Populations

Pediatrics: While specific pediatric data are limited, the benign nature of MHBs suggests similar conservative management approaches. Careful monitoring is essential due to the potential impact on developing oral structures.

Elderly: Older patients may require more vigilant monitoring for any signs of complications due to potential comorbidities affecting healing and immune response.

No specific ethnic risk groups or significant sex-based differences in management have been highlighted in the reviewed literature. 1

Key Recommendations

MRI for Diagnosis: Utilize MRI to confirm the presence and characteristics of mylohyoid boutonnières, including muscle discontinuity and herniated contents. (Evidence: Strong 1)

Conservative Management: Advise observation and regular follow-up for asymptomatic cases. (Evidence: Moderate 1)

Surgical Intervention for Complications: Consider surgical repair if there are significant symptoms or suspected complications. (Evidence: Moderate 1)

Patient Education: Educate patients about the benign nature of the lesion and the rationale behind conservative management. (Evidence: Expert opinion)

Regular Follow-Up: Schedule follow-up MRI scans every 6-12 months to monitor lesion stability. (Evidence: Expert opinion)

Refer Specialist for Complications: Refer to oral or maxillofacial surgeons if complications arise or diagnostic uncertainty exists. (Evidence: Expert opinion)

References

1 Péporté ARJ, Kostova J, Schön F, Andreisek G, Diem L, Wagner F. Oral Cavity Lesion Mimicker: How Prevalent Is the Mylohyoid Boutonnière on MRI?. AJNR. American journal of neuroradiology 2026. link 2 Aziz B, Hameed S, Hakeem H, Rehman FU, Malik MGR, Sattar S et al.. Oral and topical analgesia in pediatric electrodiagnostic studies. Muscle & nerve 2024. link 3 Pontini A, Reho F, Giatsidis G, Bacci C, Azzena B, Tiengo C. Multidisciplinary care in severe pediatric electrical oral burn. Burns : journal of the International Society for Burn Injuries 2015. link 4 Angrist RC, Gonnering RS, Dortzbach RK, Crawford K. Bio-electric conductivity potentials in experimental skin grafts. Ophthalmic plastic and reconstructive surgery 1987. link 5 Kalkwarf KL, Krejci RF, Edison AR. A method to measure operating variables in electrosurgery. The Journal of prosthetic dentistry 1979. link90255-5)

Galvanic lesion of oral cavity