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Pott disease or Pott's disease is a form of tuberculosis that occurs outside the lungs whereby disease is seen in the vertebrae. Tuberculosis can affect several tissues outside of the lungs including the spine, a kind of tuberculous arthritis of the intervertebral joints. The disease is named after Percivall Pott (1714–1788), a British surgeon. The lower thoracic and upper lumbar vertebrae are the areas of the spine most often affected. The formal name for the disease is tuberculous spondylitis and it is most commonly localized in the thoracic portion of the spine. Pott’s disease results from haematogenous spread of tuberculosis from other sites, often the lungs. The infection then spreads from two adjacent vertebrae into the adjoining intervertebral disc space. If only one vertebra is affected, the disc is normal, but if two are involved, the disc, which is avascular, cannot receive nutrients and collapses. In a process called caseous necrosis the disc tissue dies leading to vertebral narrowing and eventually to vertebral collapse and spinal damage. A dry soft tissue mass often forms and superinfection is rare. ==Diagnosis== * Blood tests :– CBC: leukocytosis :– Elevated erythrocyte sedimentation rate: >100 mm/h * Tuberculin skin test :– Tuberculin skin test (purified protein derivative ()) results are positive in 84–95% of patients with Pott disease who are not infected with HIV. * Radiographs of the spine :– Radiographic changes associated with Pott disease present relatively late. The following are radiographic changes characteristic of spinal tuberculosis on plain radiography: :# Lytic destruction of anterior portion of vertebral body :# Increased anterior wedging :# Collapse of vertebral body :# Reactive sclerosis on a progressive lytic process :# Enlarged psoas shadow with or without calcification :– Additional radiographic findings may include the following: :# Vertebral end plates are osteoporotic. :# Intervertebral disks may be shrunk or destroyed. :# Vertebral bodies show variable degrees of destruction. :# Fusiform paravertebral shadows suggest abscess formation. :# Bone lesions may occur at more than one level. * Bone scan * CT of the spine * Bone biopsy * MRI 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Pott disease」の詳細全文を読む スポンサード リンク
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