Progressive pseudorheumatoid dysplasia: A rare disease in the differential diagnosis of juvenile idiopathic arthritis

Introduction: Progressive pseudorheumatoid dysplasia (PPD) is an autosomal recessive skeletal disease. The responsible gene is called WISP3 and maps to the region 6q21 on chromosome 6. At the age of 3–6 years, stiffness and pain symmetrically involve finger joints first, later followed by hips and knees. Further symptoms are movement limitation, contractures and growth retardation. These symptoms are also found in juvenile idiopathic arthritis (JIA). Here we present one patient suffering from PPD. In this interactive poster, the different steps of this demanding differential diagnosis are explored. Case report:…