## Histological Types of Oral Cavity Carcinoma **Key Point:** Squamous cell carcinoma (SCC) accounts for approximately 90% of all oral cavity malignancies, making it by far the most common histological type. ### Distribution of Oral Cavity Carcinomas | Histological Type | Frequency | Key Features | |---|---|---| | Squamous Cell Carcinoma | 85–90% | Most common; arises from oral mucosa; associated with tobacco and alcohol | | Adenocarcinoma | 5–10% | Arises from minor salivary glands; poorer prognosis | | Mucoepidermoid Carcinoma | 2–5% | Low-grade variant; arises from salivary glands | | Verrucous Carcinoma | <2% | Variant of SCC; better prognosis; associated with tobacco | | Melanoma | <1% | Rare; very aggressive; poor prognosis | ### Characteristics of Oral SCC **High-Yield:** Oral squamous cell carcinoma is strongly associated with: - Tobacco use (smoking and smokeless) - Alcohol consumption - Betel nut/areca nut chewing (common in India) - HPV infection (increasingly recognized) - Oral submucous fibrosis (precancerous condition in Indian population) **Clinical Pearl:** The buccal mucosa and alveolar ridge are the most common sites for oral SCC in India, often related to betel quid chewing habits. **Mnemonic:** **SCCDOM** — Squamous Cell Carcinoma Dominates Oral Malignancies (90% of cases). 
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