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1. Juvenile idiopathic arthritis

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Figure 60-1

Juvenile idiopathic arthritis.

There is a small erosion in the surface of the capitate bone of this 8-year-old boy.

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2. Juvenile idiopathic arthritis

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Figure 60-2

Juvenile idiopathic arthritis.

There are erosions of the lunate and scaphoid bones of this 9-year-old girl. The carpal bones are small and irregular. There is diffuse osteopenia.

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3. Juvenile idiopathic arthritis

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Figure 60-3

Juvenile idiopathic arthritis.

An AP view of the elbow shows osteopenia, small irregular ossification centers, and an erosion in the ulna.

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4. Juvenile idiopathic arthritis

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Figure 60-4

Juvenile idiopathic arthritis.

A lateral radiograph of the ankle shows soft tissue prominence (arrows) due to distention of the ankle joint with fluid. Synovial thickening contributes to the density, although differentiation between fluid and synovium is not possible radiographically.

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5. Juvenile idiopathic arthritis

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Figure 60-5

Juvenile idiopathic arthritis.

There is periarticular soft tissue prominence at the third and fifth PIP joints. Periarticular osteoporosis is present at each of the PIP joints.

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6. Juvenile idiopathic arthritis

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Figure 60-6

Juvenile idiopathic arthritis.

A, B. AP and lateral views of the elbow show epiphyseal overgrowth and joint space narrowing.

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7. Juvenile idiopathic arthritis

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Figure 60-7

Juvenile idiopathic arthritis.

This 13-year-old girl has marked joint space narrowing, multiple lucent erosions, and minimal reactive sclerosis.

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8. Juvenile idiopathic arthritis

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Figure 60-8

Juvenile idiopathic arthritis.

There is apophyseal joint fusion from C2 to C4 and C5 to C7. Widening of the facet joints and disc space at C4-5 indicates ligamentous laxity.

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9. Juvenile idiopathic arthritis; synovial inflammation

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Figure 60-9

Juvenile idiopathic arthritis; synovial inflammation.

A. Thickened synovium and joint fluid combine to produce a hyperintense band along the anterior aspect of the knee joint (arrows). B. A T1-weighted fat-suppressed image with IV gadolinium confirms the presence of thickening and enhancement of the inflamed synovium (arrows).

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10. Juvenile idiopathic arthritis

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Figure 60-10
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