[Psoriatic Arthritis concomitant with Paget's Disease - a case report].

: Paget disease of bone is a focal disorder of bone metabolism; it is characterized by an accelerated rate of bone remodeling, with profound changes in the bone structure, making it fragile. This condition affects approximately 2% to 5% of the population older than 40. The main clinical manifestations of Paget's disease are pain and bone deformity, although the majority of patients are asymptomatic. Psoriatic Arthritis is a spondyloarthritis with a prevalence of about 0,1%. It is characterized by the presence of arthritis, enthesitis and/or dactylitis associated with a familiar or personal history of psoriasis. Several clinical patterns of joint involvement in psoriatic arthritis have been identified, namely, the polyarticular pattern, similar to rheumatoid arthritis. Arthritis precedes skin disease in approximately 13 to 17 % of the cases. The authors report a clinical case of a 60 years old patient with polyarthritis and dactylitis who was diagnosed with psoriatic arthritis and Paget's disease of bone. The concomitance of the two entities, in the same individual, with so different pathogenesis and clinical features, have never been described on literature. Because of the complexity on the clinical and imaging evaluation as the result of the coexistence of both pathologies, the authors consider relevant to publish this singular case.