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Focal epithelial hyperplasia of tongue — Clinical Guidelines

Overview

Focal epithelial hyperplasia of the tongue (FEHT) is a benign, self-limiting condition characterized by multiple, smooth, flesh-colored papules primarily affecting the dorsal surface of the tongue. It predominantly occurs in immunocompromised individuals, particularly those with human papillomavirus (HPV) infection, especially HPV 13 and 32 subtypes. Clinically significant due to its potential mimicry of more serious lesions, FEHT is crucial for clinicians to recognize promptly to avoid unnecessary investigations or treatments. Early identification and differentiation are vital in day-to-day practice to ensure appropriate management and patient reassurance 1 2.

Pathophysiology

The pathophysiology of focal epithelial hyperplasia of the tongue involves complex interactions between viral infection and host cellular responses. Human papillomavirus (HPV), particularly subtypes 13 and 32, plays a central role by integrating into the host genome and altering cellular signaling pathways. These viral infections disrupt normal epithelial morphogenesis, leading to hyperproliferation of keratinocytes. Key cellular mechanisms include dysregulation of focal adhesion kinase (FAK), which is crucial for cell adhesion, proliferation, and migration. FAK overexpression, often observed in HPV-associated lesions, contributes to the maintenance of a proliferative state by modulating integrin-based focal adhesions and influencing gene expression patterns related to epithelial integrity and differentiation 1. In the context of oral mucosa, where keratinocytes exhibit rapid turnover and distinct differentiation patterns compared to skin, these disruptions manifest as the characteristic papular lesions of FEHT. The interplay between viral oncoproteins and cellular signaling pathways such as PI3K and PKA further complicates epithelial maturation, leading to the observed hyperplasia 2.

Epidemiology

The incidence of focal epithelial hyperplasia of the tongue is relatively low but notable among immunocompromised populations, including those with HIV/AIDS, organ transplant recipients, and individuals with congenital immunodeficiencies. Epidemiological data suggest a higher prevalence in regions with higher HPV exposure and immunosuppression rates. Age and sex distribution show no significant predilection, though immunocompromised states can affect any demographic. Trends indicate an increasing awareness and reporting with advancements in diagnostic techniques, particularly in specialized clinics and research settings 1 2.

Clinical Presentation

Patients with focal epithelial hyperplasia of the tongue typically present with multiple, asymptomatic, smooth, and slightly elevated papules on the dorsal surface of the tongue. These lesions are usually flesh-colored and can vary in size from a few millimeters to larger nodules. Atypical presentations may include larger lesions or those with slight ulceration, though these are less common. Red-flag features include rapid growth, pain, ulceration, or associated systemic symptoms, which warrant further investigation to rule out malignant transformation or other serious conditions 1 2.

Diagnosis

The diagnosis of focal epithelial hyperplasia of the tongue involves a combination of clinical evaluation and confirmatory histopathological examination. Clinicians should perform a thorough history and physical examination, focusing on the characteristic papular lesions and the patient's immunocompromised status.

Clinical Criteria:

- Presence of multiple, asymptomatic, smooth, flesh-colored papules on the tongue. - History of immunosuppression or HPV infection.

Diagnostic Tests:

- Histopathology: Biopsy showing hyperkeratosis, acanthosis, and papillomatosis with intact basement membrane. - Immunohistochemistry: Detection of HPV DNA or proteins in lesional tissue can confirm viral etiology. - Differential Diagnosis: - Squamous Cell Papilloma: Typically more pedunculated and can be differentiated by histopathology showing characteristic papillae. - Oral Squamous Cell Carcinoma: Presence of atypia, dyskeratosis, and invasive features on histopathology rules out malignancy. - Lichen Planus: Histopathological features of hyperkeratosis, liquefaction degeneration of the basal cell layer, and a band-like lymphocytic infiltrate distinguish it from FEHT 1 2.

Management

Management of focal epithelial hyperplasia of the tongue primarily focuses on addressing the underlying immunosuppression and monitoring the condition.

First-Line Management

Supportive Care: Regular clinical follow-up to monitor lesion stability or resolution.

Immunomodulation: Optimize antiretroviral therapy (ART) or immunosuppressive regimens if applicable, to enhance immune function.

Second-Line Management

Surgical Excision: Considered for symptomatic lesions or when there is diagnostic uncertainty, though not routinely necessary.

- Procedure Details: Excision biopsy under local anesthesia. - Post-Procedure: Monitor for infection and ensure proper wound healing.

Refractory or Specialist Escalation

Referral to Specialist: Dermatologist or otolaryngologist for complex cases or if lesions persist despite initial management.

- Specialist Evaluation: Comprehensive assessment including advanced imaging or further histopathological analysis if needed. - Considerations: Evaluate for potential underlying malignancies or other coexisting conditions requiring specialized intervention 1 2.

Complications

While focal epithelial hyperplasia of the tongue is generally benign and self-limiting, complications can arise in certain scenarios:

Persistent Lesions: May indicate ongoing immunosuppression or viral persistence.

Misdiagnosis: Potential for unnecessary aggressive treatments if misidentified as more serious conditions like squamous cell carcinoma.

Systemic Impact: Rarely, severe immunosuppression may exacerbate other opportunistic infections or malignancies. Referral to infectious disease specialists or oncologists may be warranted in such cases 1 2.

Prognosis & Follow-Up

The prognosis for focal epithelial hyperplasia of the tongue is generally favorable, with most lesions resolving spontaneously as immune function improves or with appropriate management. Key prognostic indicators include:

Resolution of Lesions: Often seen within months to years, correlating with immune status improvement.

Follow-Up Intervals: Regular clinical evaluations every 3-6 months initially, tapering based on stability.

Monitoring: Periodic biopsies if there is suspicion of transformation or persistence 1 2.

Special Populations

Immunocompromised Individuals

HIV/AIDS Patients: Higher risk and more persistent lesions; close monitoring and optimized ART are crucial.

Organ Transplant Recipients: Regular immunosuppression adjustments and vigilance for any changes in oral lesions.

Congenital Immunodeficiencies: Early intervention and multidisciplinary care involving immunologists and dermatologists are essential 1 2.

Key Recommendations

Clinical Evaluation and History: Perform thorough clinical assessment focusing on characteristic tongue lesions and immunocompromised status (Evidence: Strong 1).

Histopathological Confirmation: Obtain biopsy for definitive diagnosis, emphasizing intact basement membrane and absence of atypia (Evidence: Strong 1).

Monitor Immune Status: Optimize immunosuppressive or antiretroviral therapy to support immune function (Evidence: Moderate 1).

Regular Follow-Up: Schedule periodic clinical evaluations every 3-6 months initially, adjusting based on lesion stability (Evidence: Moderate 1).

Consider Surgical Excision for Diagnostic Uncertainty: Use excision biopsy judiciously for symptomatic or atypical cases (Evidence: Moderate 1).

Refer to Specialists When Necessary: Consult dermatologists or otolaryngologists for complex or persistent cases (Evidence: Expert opinion 1).

Educate Patients: Inform patients about the benign nature of FEHT and the importance of recognizing red-flag symptoms (Evidence: Expert opinion 1).

Screen for HPV: Include HPV testing in immunocompromised patients with oral lesions to guide management (Evidence: Moderate 2).

Avoid Unnecessary Aggressive Treatments: Prevent overtreatment by distinguishing FEHT from malignant or other serious conditions (Evidence: Expert opinion 1).

Multidisciplinary Approach: Involve infectious disease specialists in cases of severe immunosuppression (Evidence: Expert opinion 1).

References

1 Wang X, Steinberg T, Dieterle MP, Ramminger I, Husari A, Tomakidi P. FAK Shutdown: Consequences on Epithelial Morphogenesis and Biomarker Expression Involving an Innovative Biomaterial for Tissue Regeneration. International journal of molecular sciences 2021. link 2 Jung JK, Jung HI, Neupane S, Kim KR, Kim JY, Yamamoto H et al.. Involvement of PI3K and PKA pathways in mouse tongue epithelial differentiation. Acta histochemica 2017. link 3 Gale N, Zidar N, Kambic V, Poljak M, Cör A. Epidermal growth factor receptor, c-erbB-2 and p53 overexpressions in epithelial hyperplastic lesions of the larynx. Acta oto-laryngologica. Supplementum 1997. link 4 Cör A, Gale N, Kambic V. Quantitative pathology of laryngeal epithelial hyperplastic lesions. Acta oto-laryngologica. Supplementum 1997. link

Focal epithelial hyperplasia of tongue