There are various forms of polysyndactyly, and although several classification methods have been investigated, a standardized classification method has not been established to date. Herein, we report a case of polysyndactyly with skin and bone fused at different sites, which did not match any existing classification methods.
According to the literature, in cases of multiple toes with bony abnormalities, an apoptotic disorder between the toes causes cutaneous syndactyly, followed by the formation of bony abnormalities in the fused area. However, this developmental mechanism cannot explain how the cutaneous component of the union of the toes differed from the bone fusion site that was observed in the present case. Thus, the present case is assumed to be a rare deformity in terms of embryology.
