title: Inflammatory pseudotumor of the hip: a complication of arthroplasty to be recognized by the radiologist.
abstract: Soft tissue complications following hip arthroplasty may occur either in cases of total hip arthroplasty or in hip resurfacing, a technique that has become popular in cases involving young patients. Both orthopedic and radiological literatures are now calling attention to these symptomatic periprosthetic soft tissue masses called inflammatory pseudotumors or aseptic lymphocytic vasculites-associated lesions. Pseudotumors are associated with pain, instability, neuropathy, and premature loosening of prosthetic components, frequently requiring early and difficult reoperation. Magnetic resonance imaging plays a relevant role in the evaluation of soft tissue changes in the painful hip after arthroplasty, ranging from early periprosthetic fluid collections to necrosis and more extensive tissue damage.
authors.affiliation: Titular Members of Colégio Brasileiro de Radiologia e Diagnóstico por Imagem (CBR), MDs, Radiologists at Clínica Axial Medicina Diagnóstica, Belo Horizonte, MG, Brazil.
authors.forename: Raquel de Melo Santos Vilas
authors.initials: Rde M
authors.lastname: Boas
authors.affiliation: Titular Members of Colégio Brasileiro de Radiologia e Diagnóstico por Imagem (CBR), MDs, Radiologists at Clínica Axial Medicina Diagnóstica, Belo Horizonte, MG, Brazil.
authors.forename: Ivana Andrade
authors.initials: IA
authors.lastname: Madeira
authors.affiliation: Titular Member of Colégio Brasileiro de Radiologia e Diagnóstico por Imagem (CBR), MD, Radiologist, Specialist in Musculoskeletal System Imaging at Clínica Axial Medicina Diagnóstica, Belo Horizonte, MG, Brazil.
authors.forename: Alexia Abuhid
authors.initials: AA
authors.lastname: Lopes
authors.affiliation: Titular Members of Sociedade Brasileira de Quadril and Sociedade Brasileira de Ortopedia e Traumatologia, Hip Surgeons at Hospital das Clínicas - Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG, Brazil.
authors.forename: Edson Barreto
authors.initials: EB
authors.lastname: Paiva
authors.affiliation: Titular Members of Sociedade Brasileira de Quadril and Sociedade Brasileira de Ortopedia e Traumatologia, Hip Surgeons at Hospital das Clínicas - Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG, Brazil.
authors.forename: André Soares
authors.initials: AS
authors.lastname: Rodrigues
keywords: Hip arthroplasty; Inflammatory pseudotumor of the hip; Magnetic resonance imaging