TY - CHAP M1 - Book, Section TI - Psoriatic Arthritis A1 - Hellmann, David B. A1 - Imboden Jr., John B. A2 - Papadakis, Maxine A. A2 - McPhee, Stephen J. A2 - Rabow, Michael W. PY - 2020 T2 - Current Medical Diagnosis and Treatment 2020 AB - ESSENTIALS OF DIAGNOSISPsoriasis precedes arthritis in 80% of cases.Arthritis: usually asymmetric, with “sausage” appearance of fingers and toes; polyarthritis that resembles rheumatoid arthritis also occurs.Sacroiliac joint involvement common.Radiographic findings: osteolysis; pencil-in-cup deformity; relative lack of osteoporosis; bony ankylosis; asymmetric sacroiliitis and atypical syndesmophytes. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2021/01/17 UR - accessmedicine.mhmedical.com/content.aspx?aid=1174855585 ER -