Circumferential fingernail.

We describe a Brazilian girl with a congenital circumferential nail on her left ring finger associated with other bony and soft tissue abnormalities of the affected limb. The tubular nail plate resembling a punch biopsy has been described as a circumferential nail, an extremely rare congenital malformation that can be associated with other congenital anomalies. In our review of the literature, there have only been two previous reports of this unusual condition affecting the fingernails.