[Solitary plasmacytoma. Apropos of a case of craniofacial involvement].

The authors report the case of a 24 years-old man who had a first tumor in the right maxilla diagnosed as Ewing's sarcoma and treated by chemotherapy and radiotherapy. A second tumor appeared in the skull vault twenty seven months later. The histological diagnosis after removal of the lesion was IgG Lambda plasmacytoma. The revision of the histological cut of the maxillary tumor retained the same diagnosis. The patient is without evidence of local recurrence and systemic diffusion of the disease two years after treatment. The authors insist on the necessity of immunochemistry to establish the diagnosis.