Recently a case considered to have an extremely rare heterotopic supernumerary limb was experienced.
The case was a one month old girl who had a supernumerary limb appended on the caudad side of the ninth thoracic vertebra which could not be identified as to whether it was an upper or lower limb. The limb was readily excised, and studies by softex X-ray, arteriography and anatomical procedures were performed. The findings noted are introduced.