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Occipitocervical malformation with atlas duplication
  1. Fon-Yih Tsuang1,3,
  2. Jo-Yu Chen2,3,
  3. Yao-Hong Wang2,3,
  4. Dar-Ming Lai1,3
  1. 1Division of Neurosurgery, Department of Surgery, National Taiwan University Hospital, Taipei City, Taiwan
  2. 2Department of Medical Imaging, National Taiwan University Hospital, Taipei City, Taiwan
  3. 3Clinical Center of Neuroscience and Behavior, National Taiwan University Hospital, Taipei City, Taiwan
  1. Correspondence to Dar-Ming Lai, National Taiwan University Hospital, Division of Neurosurgery, Department of Surgery, No.7, Chung-Shan South Road, Taipei City, Taiwan; dmdlai{at}ntu.edu.tw

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Introduction

A 55-year-old man presented to our institution with tetraparesis after a ground-level fall. The presence of hyper-reflexia in four limbs led to suspicion of cervical myelopathy. Initial cervical spine plain x-ray films showed spinal canal stenosis at C1/C2, os odontoideum and two atlas-like vertebrae. Duplication of the atlas in humans …

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