[Immunohistology in assessment of the spread of cancer].

The prognosis of cancers is conditioned by tumoral extension. We report a case of a squamous carcinoma of the vulva where pathological examination had been at fault. An immunohistological study performed with monoclonal antibodies revealed a lymph node micro-metastasis. This case emphasizes the importance of estimating the tumoral extension by simultaneous pathological and immunological examinations.