Figure 9a. Tuberculous spondylitis with abscess formation in an 18-month-old girl who had two supraclavicular fistulas on the left side. (a) Axial CT scan at the thoracic level shows fragmented destruction of the vertebral body with an associated large paraspinal mass (arrow), which is probably surrounded by the prevertebral fascia. Note the small bone fragment indenting the thecal sac anteriorly (black arrowhead). Calcification of a right carinal lymph node is seen (white arrowhead). (b) Contrast-enhanced axial CT scan of the lower neck shows prevertebral extension of the tuberculous abscess, which demonstrates hypoattenuating central areas (arrowheads). (Figs 9a and 9b courtesy of U. V. Willi, MD, University Children's Hospital, Zurich, Switzerland.)