title: Double disease in rheumatology: coexistence of rheumatoid arthritis and psoriatic arthritis.
abstract: Since rheumatoid arthritis (RA) and psoriatic arthritis (PA) are common diseases, there should be a group of patients in which the two entities coexist, with an estimated prevalence ranging from 0.03/10,000 to 0.15/10,000. The two entities may share clinical, analytic and radiologic features that further complicate the diagnosis. We report here a patient in whom RA and PA coexisted. The features that differentiate peripheral arthritis in RA and PA are discussed.
authors.affiliation: Service of Rheumatology, Hospital Puerta de Hierro, Facultad de Medicina, Universidad Autonoma, Madrid, Spain.
authors.forename: R
authors.initials: R
authors.lastname: Mazzucchelli
authors.forename: M
authors.initials: M
authors.lastname: Yebra
authors.forename: C
authors.initials: C
authors.lastname: Barbadillo
authors.forename: E
authors.initials: E
authors.lastname: Berrocal
authors.forename: J C
authors.initials: JC
authors.lastname: Gea
authors.forename: J L
authors.initials: JL
authors.lastname: Andreu-Sanchez
mesh_terms: D015535:Arthritis, Psoriatic / Q000150:complications* / Q000175:diagnosis / Q000453:epidemiology; D001172:Arthritis, Rheumatoid / Q000150:complications* / Q000175:diagnosis / Q000453:epidemiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D015995:Prevalence