Psoriatic arthritis. Photograph of the hand (A) demonstrates diffuse fusiform swelling and erythema of the second digit, called a “sausage digit.” Radiograph.

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Psoriatic arthritis. Photograph of the hand (A) demonstrates diffuse fusiform swelling and erythema of the second digit, called a “sausage digit.” Radiograph of the hand (B) shows fusiform soft tissue swelling of the second digit without underlying osseous abnormality. Coronal (C) and axial (D) STIR MR sequence of the hand shows marked increased fluid signal around the second digit consistent with inflammation. (Reproduced from Giaconi L, Learch T. Psoriatic arthritis. In: Musculoskeletal Imaging Cases, Tehranzadeh J, ed. New York, NY: McGraw-Hill; 2009:262-263.) Source: Arthritis and Infection, Basic Musculoskeletal Imaging Citation: Tehranzadeh J, MD. Basic Musculoskeletal Imaging; 2016 Available at: http://accessphysiotherapy.mhmedical.com/DownloadImage.aspx?image=/data/books/1788/ch6fg44a.png&sec=123932900&BookID=1788&ChapterSecID=123771255&imagename= Accessed: October 23, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved