en Hand Surgery Hand Surgery case report case report <p>Preaxial polydactyly is the most common duplication pattern in white and Asian populations (1).It is a congenital anomaly with a wide range of manifestations .Current classification do not have the capacity to classify all different types of radial polydactyly. We describe here a very rare and unusual case of bilateral preaxial polydactyly (triplication) in a woman and report the operations results. We have not found similar case in the literature.<strong> </strong>Our case is unique and did not fit into the classification systems described for thumb polydactyly. <strong></strong></p><p> <strong> </strong></p> Congenital Anomaly, Preaxial polydactyly, Thumb, Triphalangeal, Triplication. 91 94 http://mjiri.iums.ac.ir/browse.php?a_code=A-10-1-578&slc_lang=en&sid=1 Davood Jafari djafari@tums.ac.ir 20031947532846007671 20031947532846007671 Yes Shafa Yahyaian Hospital, Tehran University of Medical Sciences, Tehran, Iran. Hooman Shariatzade shariatzade-h@yahoo.com 20031947532846007672 20031947532846007672 No Department of Hand Surgery, Shafa Yahyaian Hospital, Tehran University of Medical Sciences, Tehran, Iran. Farid Najd Mazhar fnajdmazhar@yahoo.com 20031947532846007673 20031947532846007673 No Department of Hand Surgery, Shafa Yahyaian Hospital, Tehran University of Medical Sciences, Tehran, Iran. Behzad Abbasgholizadeh babbasgholi@ymail.com 20031947532846007674 20031947532846007674 No Department of Hand Surgery, Shafa Yahyaian Hospital, Baharestan Sq, Tehran, Iran. Ahmad Dashtebozorgh 20031947532846007675 20031947532846007675 No Tehran University of Medical Sciences, Tehran, Iran.