Oral Cancer Surgery and Neck Dissection: Basics Guide

Oral cancer — most often squamous cell carcinoma of the tongue, floor of mouth, cheek or gums — ranks among India's commonest cancers, driven largely by tobacco, betel quid and alcohol. Surgery is the mainstay for most early and many advanced cases: the tumour is removed with a margin of healthy tissue, and neck lymph nodes are addressed because this cancer spreads to nodes early.

Neck dissection is the planned removal of neck lymph node groups — not because nodes are always cancerous, but because microscopic spread invisible on scans is common. Done well, tumour removal plus neck dissection cures a large share of early cancers; done late, the cancer usually returns in the neck.

Key Concepts

• Squamous cell carcinoma (SCC): cancer of the mouth lining — over 90% of oral cancers.
• Surgical margin: the rim of healthy tissue removed with the tumour; 1-1.5 cm clear is the standard goal.
• Neck dissection: systematic removal of node levels I-V; selective, modified radical or radical depending on spread.
• Elective neck dissection: removing nodes even when scans look clear, because occult spread is common in early tongue cancers.
• Neck levels: Level I (under chin/jaw), II-IV (jugular chain), V (behind the sternomastoid) — the surgeon's map.
• Reconstruction: rebuilding the defect, from simple closure to free flaps of skin, muscle or bone.

How It Works

1. Biopsy and stage. Incisional biopsy confirms SCC; CT/MRI and chest imaging set the TNM stage.
2. Resect the tumour. Remove it with at least a 1 cm healthy margin in all directions; frozen section confirms clear edges during surgery.
3. Dissect the neck. Selective dissection of Levels I-III (plus IV for tongue cancers); visible disease triggers wider clearance.
4. Protect vital nerves. The spinal accessory, marginal mandibular and hypoglossal nerves are preserved whenever oncologically safe.
5. Reconstruct immediately. Same-operation rebuilding avoids delaying healing and radiotherapy.
6. Plan further treatment. Positive margins, multiple nodes or extranodal spread mean postoperative radiotherapy, with or without chemotherapy.

Worked Example

A 55-year-old tobacco chewer has a 2.5 cm tongue ulcer for 3 months — T2 (the 2-4 cm band). The surgeon removes it with 1 cm margins all around: defect = 2.5 + 1 + 1 = 4.5 cm. Selective neck dissection of Levels I-IV yields 20 nodes; 1 is positive with no extranodal extension, and margins are clear by over 5 mm. With a single positive node and no adverse features, he receives postoperative radiotherapy to the neck — a far better outlook than tumour removal alone would give.

Common Misconceptions

• "Clear scans mean neck surgery is unnecessary." Scans miss microscopic spread; elective dissection is standard for scan-negative necks.
• "A painless ulcer is harmless." Oral cancer is often painless early — any ulcer beyond 2-3 weeks needs biopsy.
• "Tongue surgery destroys speech." Partial resections with modern reconstruction preserve intelligible speech in most patients.

Real-World Applications

• Head-and-neck oncology units performing combined tumour-plus-neck surgery daily.
• Tobacco-cessation programmes using surgical outcomes as the starkest quitting argument.
• Screening camps where biopsying non-healing ulcers catches curable-stage cancers.

Oral cancer surgery cures by removing the tumour with clear margins and controlling the neck where this cancer hides. Surgery is the centre of a chain — early biopsy, precise pathology and timely radiotherapy complete it — but without complete surgery, the chain cannot hold.