Premalignant Disorders
Oral Submucous Fibrosis
aka OSMF
Chronic, progressive, scarring disease of oral mucosa strongly associated with areca nut chewing; a WHO-recognised potentially malignant disorder.
§ overviewOverview
Chronic, progressive, scarring disease of oral mucosa strongly associated with areca nut chewing; a WHO-recognised potentially malignant disorder.
§ etiologyEtiology
- 01Areca nut (arecoline)
- 02Capsaicin
- 03Nutritional deficiencies
- 04Genetic predisposition (HLA-A10, DR3, DR7)
§ epidemiologyEpidemiology
Highest prevalence in Indian subcontinent. Young adults.
§ pathogenesisPathogenesis
Arecoline stimulates fibroblast proliferation & collagen synthesis, reduces collagen degradation, and increases TGF-β.
§ clinicalClinical Features
- 01Burning sensation, especially with spicy food
- 02Blanched marble-like mucosa
- 03Palpable vertical fibrous bands
- 04Progressive trismus
- 05Depapillation of tongue
§ histopathHistopathology
- 01Early: juxtaepithelial oedema and hyalinisation
- 02Advanced: dense hyalinised collagen bundles, atrophic epithelium, epithelial dysplasia
§ classificationClassification
- 01Khanna & Andrade (I–IVB) — clinical + histopathologic
- 02Pindborg staging (Stage 1–3)
§ treatmentTreatment
- 01Habit cessation (mandatory)
- 02Intralesional steroids ± hyaluronidase
- 03Placental extract injection, pentoxifylline, lycopene
- 04Surgical release of fibrous bands + reconstruction (buccal fat pad, nasolabial flap) for severe trismus
- 05Physiotherapy — mouth-opening exercises
§ prognosisPrognosis
Malignant transformation 7–13%.
§ preventionPrevention
- 01Public health campaigns against areca/pan masala use
§ pearlsClinical Pearls
- 01OSMF is irreversible — early diagnosis is critical.
§ mcqsMCQs — Assessment (1)
Question 1
Principal aetiological agent of OSMF:
Draft — pending faculty review. Educational use only; verify against current guidelines and primary sources before clinical application.