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Updated: Jun 21, 2026

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Measuring Psoriasis Severity at Home
Published on: March 1, 2024
Psoriatic arthritis sine psoriasis
Ignazio Olivieri1, Angela Padula, Salvatore D'Angelo
1Rheumatology Department of Lucania, San Carlo Hospital of Potenza, 85100 Potenza, Italy.
The Journal of Rheumatology. Supplement
|August 8, 2009
Summary
Psoriatic arthritis sine psoriasis occurs in 20% of patients, where joint issues appear before skin lesions. Diagnosis considers dactylitis, specific HLA type, and family history, aligning with CASPAR criteria.
Area of Science:
- Rheumatology
- Dermatology
- Immunogenetics
Background:
- Psoriatic arthritis (PsA) can manifest rheumatologically before cutaneous lesions in 20% of cases.
- This presentation is termed psoriatic arthritis sine psoriasis (PsA-SP).
- Historically, PsA-SP was misclassified under undifferentiated spondyloarthritis.
Purpose of the Study:
- To define the clinical spectrum and diagnostic considerations for PsA-SP.
- To highlight the inclusion of PsA-SP within the Classification of Psoriatic Arthritis (CASPAR) criteria.
Main Methods:
- Review of clinical presentations in PsA patients.
- Analysis of diagnostic features including family history and genetic markers.
- Evaluation against established classification criteria (CASPAR).
Main Results:
- PsA-SP is characterized by a broad clinical spectrum.
- Key diagnostic indicators include dactylitis, distal interphalangeal arthritis, and HLA-Cw6.
- A family history of psoriasis is a significant identifying factor.
Conclusions:
- PsA-SP represents a distinct subset of psoriatic arthritis.
- Accurate identification relies on specific rheumatological and genetic markers.
- The CASPAR criteria effectively encompass PsA-SP, improving diagnostic accuracy.
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