Treatment for mild macrodactyly with only overgrowth of the solitary finger caused by vascular malformations (VMs) is rarely reported. We encountered a case of right middle finger overgrowth resulting from a VM in a seven-year-old girl. The length of her middle finger was 7.7 mm longer than her left middle finger. In order to control additional overgrowth, epiphysiodesis was planned when the finger reached the same length as that of her mother's finger. At the age of 12, her right middle finger length reached the same length as her mother's finger, and epiphysiodesis was performed. The length of her middle finger was 9.4 mm longer than her left middle finger. No additional overgrowth of the right finger occurred after surgery; however, the normal left finger stopped growing earlier than expected, maintaining a left-right difference of approximately 10 mm. No functional disorders were observed at a follow-up of 2.5 years. The timing of epiphysiodesis should be determined through a comprehensive assessment of multiple factors, not only the length of the parents' fingers.
Keywords: epiphysiodesis; finger overgrowth; proximal interphalangeal joint; timing of surgery; vascular malformation.
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