CHORUS
Collaborative Hypertext of Radiology
Musculoskeletal system
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psoriatic arthritis
types:
- true psoriatic arthritis (1/3)
- resembling rheumatoid arthritis (1/3)
- combination of psoriatic and RA (1/3)
findings:
- no juxta-articular osteoporosis (unlike RA)
- periosteal reaction frequent
- assymetrical destruction of DIP with ankylosis
- resorption of terminal tufts with "pencil in cup" deformity
- ivory phalanx
- destruction of 1st toe IP joint with periosteal reaction and
bony proliferation at distal phalangeal base (PATHOGNOMONIC)
- assymetrical syndesmophytes (lower C- to upper L-spine)
- squaring of vertebrae in L-spine
- paravertebral soft tissue calcifications
- bilateral assymetrical sacroiliitis
a/w HLA B-27 antigen, negative rheumatoid factor
Yong H. Hahn, MD - 2 February 1995
Last updated: 1 October 2013
Copyright © 2013, Charles E. Kahn, Jr.
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