title: [Lofgren syndrome: the relevance of the chest X-ray].
abstract: Sarcoidosis is a systemic granulomatosis of unknown origin characterized by a formation of non-caseating granulomas in multiple organs, which can present as a chronic, sub acute or an acute form. Löfgren's syndrome is an acute form of sarcoidosis characterized by the presence of arthritis/arthralgia, eritema nodosum lesions and hilar lymphadenopathy. The authors present 3 case reports of arthritis/ /arthralgia and eritema nodosum lesions in 3 young patients in which the diagnosis was Löfgren's syndrome. The radiological findings were essential for the final diagnosis, especially in the presence of a normal value of serum angiotensin-converting enzyme.
authors.affiliation: Médica do Internato Complementar de Reumatologia dos Hospitais da Universidade de Coimbra, Praceta Mota Pinto, Coimbra. catambrosio1@netcabo.pt
authors.forename: Catarina
authors.initials: C
authors.lastname: Ambrósio
authors.forename: Armando
authors.initials: A
authors.lastname: Malcata
mesh_terms: D000328:Adult; D018771:Arthralgia / Q000000981:diagnostic imaging*; D001168:Arthritis / Q000000981:diagnostic imaging*; D004893:Erythema Nodosum / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D008206:Lymphatic Diseases / Q000000981:diagnostic imaging*; D008297:Male; D013902:Radiography, Thoracic; D012507:Sarcoidosis / Q000000981:diagnostic imaging*; D013577:Syndrome