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- Confluent granuloma with central caseous necrosis |
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- Pannus over the articular cartilage with erosion into bone along the joint margin |
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- Fibrous ankylosis and obliteration of the joint space |
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- Hip and knee involvement in childern, but the vertebral column is common in adult |
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- Bony destruction of the vertebral column with wedging and complete collapse of vertebrae called Pott's disease of spine |
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- Psoas abscess. |