Is Aphtous Oral Ulceration Biopsy always Useless?

Objective: To report a case of Behçet’s disease whose diagnosis was only confirmed thanks to an oral aphthous lesion biopsy. Materials and methods: Conventional histopathological analysis of a biopsy of an aphthous oral lesion that had appeared two days previously. Results: A small vein vasculitis with eosinophil and neutrophil granulocytes was evidenced. Conclusion: The presence of a small vein vasculitis was here strongly in favour of Behçet's disease, whereas such a diagnosis was not confirmed according to the International Study Group’s criteria.