#spinal_curvature  an abnormal curvature of the vertebral column
  supertype:  #abnormalcy__abnormality__abnormal_condition  an abnormal condition
  subtype:  #kyphosis__humpback__hunchback  an abnormal backward curve to the vertebral column
  subtype:  #lordosis__hollow-back  an abnormal inward (forward) curvature of the vertebral column
  subtype:  #scoliosis__scoliosi  an abnormal lateral curve to the vertebral column

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