[Plasmacytic reticulosis].

The authors observed one case of plasmocytic reticulosis which was noticable by its strictly left unilateral localisation, involving the face, the underscapular region, the shoulder and the elbow, the leg with an important augmentation of the left foot. Histologically, dense plasmocytic infiltration can be observed without anomalies. Electron microscopy confirmes the presence of plasmocytes at any stage of activity without monstruosities. This observation can not be classified in the forms that are actually described: Klüken's and Simonis' plasmocytic reticulosis, plasmocytomas with osseous and medullar lesions, extramedullar plasmocytoma.