In Ankylosing Spondylitis, which sign is described as the trolley track appearance on imaging?

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Multiple Choice

In Ankylosing Spondylitis, which sign is described as the trolley track appearance on imaging?

In ankylosing spondylitis, the trolley track appearance on imaging reflects inflammatory damage at the sacroiliac joints. Erosion and reactive sclerosis occur on both the iliac and sacral margins, producing two parallel dense lines along the joint with a narrow gap in between—this creates a look like railroad trolley tracks. This pattern is a classic, recognizable sign of sacroiliitis in AS, making it the best descriptor among the options. Other signs listed describe different imaging patterns not characteristic of AS sacroiliitis (for example, signs associated with other conditions like osteonecrosis or different joint changes), so they don’t fit as the typical sacroiliac joint appearance in AS.

In ankylosing spondylitis, the trolley track appearance on imaging reflects inflammatory damage at the sacroiliac joints. Erosion and reactive sclerosis occur on both the iliac and sacral margins, producing two parallel dense lines along the joint with a narrow gap in between—this creates a look like railroad trolley tracks. This pattern is a classic, recognizable sign of sacroiliitis in AS, making it the best descriptor among the options.

Other signs listed describe different imaging patterns not characteristic of AS sacroiliitis (for example, signs associated with other conditions like osteonecrosis or different joint changes), so they don’t fit as the typical sacroiliac joint appearance in AS.

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