Pencil-in-cup deformity
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Pencil-in-cup deformity is the description given to one of the appearances on plain radiographs classically associated with psoriatic arthritis; however, it is not pathognomonic.
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
,2 -
rheumatoid arthritis
, or -
reactive arthritis
. - Behçet disease: case reports 3
-<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>- +<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>; however, it is not <a href="/articles/pathognomonic">pathognomonic</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:</p><ul>
- +<li>
- +<a href="/articles/scleroderma">systemic sclerosis</a> <sup>2</sup>
- +</li>
- +<li><a href="/articles/rheumatoid-arthritis">rheumatoid arthritis</a></li>
- +<li><a href="/articles/reactive-arthritis">reactive arthritis</a></li>
- +<li>
- +<a title="Behcet disease" href="/articles/behcet-disease-2">Behçet disease</a>: case reports <sup>3</sup>
- +</li>
- +</ul>
References changed:
- 3. Tan J, Göğüş F, Sepici V. 'Pencil-in-cup' deformity in Behçet's disease. (1993) British journal of rheumatology. 32 (7): 644-5. <a href="https://doi.org/10.1093/rheumatology/32.7.644-a">doi:10.1093/rheumatology/32.7.644-a</a> - <a href="https://www.ncbi.nlm.nih.gov/pubmed/8339145">Pubmed</a> <span class="ref_v4"></span>
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