Histological findings and treatment in floating-type polydactyly of the thumb: A report of two cases

Abstract

Here, we report two cases of floating-type polydactyly of the thumb. The supernumerary thumb, including the nail and hypoplastic osseous component, had a narrow and long cutaneous pedicle or a wide base. The histological findings of the supernumerary thumbs were notable for the proliferation of nerve bundles, eccrine ducts, and intramembranous ossification. Suture ligation or surgical excision was selected based on the estimation of the functional outcome from the bifurcation level of the supernumerary thumb, and the parent’s preference. No major complications were observed in either of the groups.