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. 2021 Feb 1;12(4):8868. doi: 10.4081/or.2020.8868

Figure 1.

Figure 1.

a) Palmar keratosis, starfish keratosis and digital constriction bands on the PIP joint; b) radiographs show periosteal thinning of the proximal phalanx; c) MRI shows periosteal thinning and a lack of visualization of the extensor tendon at the proximal PIP.