Fibular dimelia accompanied by complete tibial agenesis and mirror polydactyly or foot duplication is a rare developmental anomaly reported in at least 11 cases. It can be isolated or associated with ulnar dimelia, facial abnormalities and sacrococcygeal teratoma. The cause is unknown, but has been suggested that a teratogenic event occurs as developmental specification reaches the level of the future knee. A central role for the mesenchymal precursor, from which chondro-osseous morphology emerges, has also been suggested. Treatment is surgical and prosthesis is needed in order to improve the quality of life of affected children. [from
SNOMEDCT_US]