[Oral manifestation of a mantle cell lymphoma - a swelling in the buccal mucosa as the initial manifestation of mantle cell lymphoma: a case report].

Lymphomas are malignant neoplasms of mature and immature B-cells, T-cells or NK-cells at various stages of differentiation. They predominantly occur in lymphoid tissues, manifestations in the oral cavity are rare: 3.5% of all oral malignancies are lymphomas.