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Results 1 - 1 of 1 for supernumerary digit OR "malformation," congenital
  1. Polydactyly 
    ... this condition in your personal medical record. Extra digits may be discovered after the first 3 months of pregnancy with ultrasound or a more advanced test called embryofetoscopy.
    https://medlineplus.gov/ency/article/003176.htm - Medical Encyclopedia