A 52-year-old woman with a 20-year history of reverse smoking (smoking from the burning end inside the mouth) presents with a 4-month history of a painless, white patch on the hard palate. On examination, there is a 1.5 cm × 1 cm white, slightly raised lesion with a central red area (erythroplakia within leukoplakia) on the hard palate. The lesion is non-tender. Oral hygiene is poor. She denies any systemic symptoms. Biopsy shows dysplasia with foci of invasive squamous cell carcinoma. What is the most appropriate next step in management?

Explanation

## Management of Oral Cavity Carcinoma with Dysplasia **Key Point:** When biopsy reveals invasive squamous cell carcinoma (even with dysplasia), surgical excision with adequate margins is the gold standard. Elective neck dissection is indicated due to the high risk of occult cervical metastasis. ### Surgical Management Algorithm ```mermaid flowchart TD A[Oral cavity lesion with biopsy]:::outcome --> B{Histology findings?}:::decision B -->|Dysplasia only| C[Excisional biopsy with margins]:::action B -->|Invasive SCC| D[Wide local excision]:::action D --> E{Tumor size & depth?}:::decision E -->|T1-T2, <4mm depth| F[Excision alone, observe neck]:::action E -->|T1-T2, >4mm depth| G[Excision + Elective neck dissection]:::action E -->|T3-T4| H[Excision + Elective neck dissection + Adjuvant RT/CRT]:::action G --> I[Pathology assessment]:::outcome H --> I I --> J{Adverse features?}:::decision J -->|PNI, positive margins, >2 nodes| K[Adjuvant chemoradiotherapy]:::action J -->|No adverse features| L[Surveillance]:::action ``` ### Why Elective Neck Dissection? **High-Yield:** Hard palate carcinomas have a 30–40% risk of occult cervical lymph node metastasis, even in clinically N0 necks. The presence of invasive carcinoma with dysplasia further elevates this risk. **Clinical Pearl:** Hard palate tumors drain primarily to: - Level I (submandibular) nodes - Level II (upper jugular) nodes - Level III (middle jugular) nodes Elective neck dissection (typically selective levels I–III) is recommended for: - Tumors >2 cm - Depth >4 mm - Presence of perineural invasion - High-grade histology ### Margin Assessment **Warning:** "Adequate margins" in oral cavity carcinoma typically means: - Lateral margins: ≥5 mm - Deep margins: ≥5 mm (down to periosteum or deeper if invasion suspected) - Margins <3 mm are considered inadequate and warrant re-excision or adjuvant therapy ### Why Other Options Are Incorrect | Option | Why Wrong | | --- | --- | | Topical 5-FU | Only for dysplasia/carcinoma in situ, not invasive SCC. Topical agents cannot achieve adequate depth penetration. | | Palliative chemotherapy alone | Chemotherapy without surgery is not curative for localized resectable disease. Reserved for unresectable/metastatic cases. | | Observation with repeat biopsy | Invasive carcinoma requires definitive treatment. Delaying surgery increases risk of progression and metastasis. | ### Adjuvant Therapy Considerations After excision and neck dissection, adjuvant radiotherapy or chemoradiotherapy is indicated if: - Positive surgical margins - Perineural invasion - Lymph node involvement (especially ≥2 nodes or extranodal extension) - High-grade histology - Depth >4 mm [cite:Park 26e Ch 15; Robbins 10e Ch 9]