Arthritis, Psoriatic

**Definition:** A type of inflammatory arthritis associated with PSORIASIS, often involving the axial joints and the peripheral terminal interphalangeal joints. It is characterized by the presence of HLA-B27-associated SPONDYLARTHROPATHY, and the absence of rheumatoid factor.

**Tree numbers:** - C05.116.900.853.625.800.424 - C05.550.114.145 - C05.550.114.865.800.424 - C17.800.859.675.175

**Synonyms:** - Psoriasis Arthropathica - Psoriasis, Arthritic - Psoriatic Arthropathy - Psoriatic Arthritis