[Juvenile xanthogranuloma in a flat xanthoma].
A case of juvenile xanthogranuloma located on a plane xanthoma plaque in the left flank of a seven months old child is reported. Histologically we observe a typical pattern of JXG in the center of the lesion and foamy cells exclusively around the capillary vessels in the peripheric areas of the lesion. We consider that the same etiopathogenic mechanisms implicated in the JXG will produce the clinical and histologic appearance of plane xanthoma around it.