telescoping finger

telescoping finger

a digital deformity with collapsing of soft tissue resultant from the bone resorption in arthritis nutilans.
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One of the clinical manifestations of this condition is shortening of one or more digits due to severe osteolysis, a deformity called "opera glass finger" or "telescoping finger." The radiographic findings of PsA mutilans suggest gross osteolysis and pencil-in-cup deformities in joints, as well as rapid progress.