Florid periosteal reaction and focal fibrocartilaginous dysplasia.

Focal fibrocartilaginous dysplasia (FFCD) is a rare condition causing tibia vara in childhood. It is characterized by progressive tibia vara in young children with a characteristic radiographic lesion. This paper is thought to be the first to describe FFCD exhibiting florid periosteal reaction at the time of presentation with a subtle faint osteolytic lesion in the diametaphysis of the proximal tibia.