Pencil-in-cup deformity
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Pencil-in-cup deformity is the description given to one of the appearances on plain radiographs inclassically associated with psoriatic arthritis.
Radiographic features
The appearance results from periarticular erosions and bone resorption giving the appearance of a pencil in a cup.
Differential diagnosis
Although classically described with psoriatic arthritis, this appearance can also be seen in systemic sclerosis, rheumatoid arthritis or reactive arthritis.
-<p><strong>Pencil-in-</strong><strong>cup deformity</strong> is the description given to one of the appearances on plain radiographs in <a href="/articles/psoriatic-arthritis">psoriatic arthritis</a>.</p><h4>Radiographic features</h4><p>The appearance results from periarticular erosions and bone resorption giving the appearance of a pencil in a cup.</p><h4>Differential diagnosis</h4><p>Although classically described with psoriatic arthritis, this appearance can also be seen in <a title="Systemic sclerosis" href="/articles/scleroderma">systemic sclerosis</a>, <a title="Rheumatoid arthritis" href="/articles/rheumatoid-arthritis">rheumatoid arthritis</a> or <a title="Reactive arthritis" href="/articles/reactive-arthritis">reactive arthritis</a>.</p>- +<p><strong>Pencil-in-</strong><strong>cup deformity</strong> is the description given to one of the appearances on plain radiographs classically associated with <a href="/articles/psoriatic-arthritis">psoriatic arthritis</a>.</p><h4>Radiographic features</h4><p>The appearance results from periarticular erosions and bone resorption giving the appearance of a pencil in a cup.</p><h4>Differential diagnosis</h4><p>Although classically described with psoriatic arthritis, this appearance can also be seen in <a href="/articles/scleroderma">systemic sclerosis</a>, <a href="/articles/rheumatoid-arthritis">rheumatoid arthritis</a> or <a href="/articles/reactive-arthritis">reactive arthritis</a>.</p>
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