Primary extranodal non-Hodgkin lymphoma of the oral cavity.

Lymphoma is the second most common neoplasm of the head and neck after squamous cell carcinoma. Nearly 24% to 48% of non-Hodgkin lymphoma can arise in extranodal localizations and 3% to 5% of which were primarily located in the oral cavity. Waldeyer ring is the most frequently involved site. The authors report 2 cases of primary extranodal non-Hodgkin lymphoma of the oral cavity, not of the Waldeyer ring.