OMFS-0107Malignant lesionsOncologyintermediateBuccal mucosa

Progressive trismus in an areca nut chewer

31-year-old male

Draft — educational study aid, pending faculty review.

§Chief complaint

Unable to open the mouth wide and burning on spicy food for 2 years

§Medical & dental history

01Chews betel quid with areca nut 8-10 times daily for 10 years
02No systemic disease
03Difficulty with routine dental treatment due to limited opening

§Clinical examination

01Maximum interincisal opening 21 mm
02Blanched, marble-white buccal mucosa with palpable vertical fibrous bands bilaterally
03Loss of tongue papillae and restricted tongue protrusion
04Uvula shrunken; no ulceration or induration

§ figuresFigures (1)

Oral Submucous Fibrosis — clinical image: Generalized submucous fibrosis of oral cavity — Fig. 1Generalized submucous fibrosis of oral cavity
“Oral submucous fibrosis” · Saivishnu.ponnapalli · CC BY-SA 4.0 · Wikimedia Commons

Verified open-access images only, reproduced for education under their stated licences · no AI-generated or illustrative artwork · Oral Submucous Fibrosis figures pending faculty review.

§Differential diagnosis

Oral submucous fibrosisPalpable fibrous bands, blanching, areca habit

SclerodermaSkin changes, Raynaud phenomenon, widened PDL

Post-radiation fibrosisHistory of radiotherapy

Extra-articular trismus from infectionAcute, painful, febrile

§Final diagnosis

Oral submucous fibrosis, clinical stage III

Palpable fibrous bands with mucosal blanching in a long-standing areca nut chewer, without skin involvement or radiation history, is diagnostic. Staging is by mouth opening and functional limitation.

§Investigations

01Incisional biopsy — to grade fibrosis and exclude dysplasia or occult carcinoma
02Haemoglobin and iron studies
03Photographic and interincisal opening records

§Treatment plan

01Absolute cessation of areca nut and tobacco
02Intralesional corticosteroid and hyaluronidase injections
03Supervised physiotherapy with mouth-opening exercises
04Surgical band release with grafting if opening remains under 25 mm

§Surgical procedure

01Bilateral fibrotic band release with coronoidectomy
02Defect covered with buccal fat pad flaps
03Aggressive physiotherapy from day 5

§Histopathology report

Atrophic epithelium with loss of rete ridges overlying dense hyalinised, hypovascular collagenous connective tissue with sparse chronic inflammatory cells. No epithelial dysplasia identified.

§Follow-up & outcome

01Mouth opening 35 mm at 6 months with continued exercises
02Lifelong surveillance — malignant transformation risk 7-13 percent

§Clinical pearls / learning points

01OSMF is a potentially malignant disorder; surgery relieves trismus but does not remove cancer risk.
02Relapse is almost guaranteed without habit cessation and sustained physiotherapy.
03Trismus makes any future oral cancer harder to detect early — examine meticulously.

§ evidenceReferences & Evidence

Current Classification

WHO Classification of Tumours Online — Head and Neck

IARC / WHO · 2022

Continuously updated online edition of the WHO head and neck tumour classification.

View official source

Evidence summary

Highest level of evidence linked to this page: WHO / Official Classification.

L1 · Classification — 1
L2 · Guideline — 1
L6 · Textbook — 3

1 linked source was published from 2024 onwards. Where guidance is limited or contested, rely on the higher-level sources above rather than this summary. Educational use only — not a substitute for clinical judgement.

Content last reviewed

September 2026

Evidence last reviewed

September 2026

Next scheduled review

September 2027

Review status

EVIDENCE REVIEWED

Search latest PubMed evidence

Last literature search: 7 September 2026

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Current Classification