[Tumor of the mouth floor: submucosal schwannoma].

We report a 77 years old patient with a tumour of the floor of the mouth. The long clinical evolution and its big size--longest diameter: 7.5 cm.--, are the most stringling clinical characteristics of this case. The pathologic study showed a schwannoma, a very unusual neoplasm in this situation. We focus our discussion in pathological aspects and differential diagnosis.