Oligo-arthrite tuberculeuse : un diagnostic différentiel de l'arthrite juvénile idiopathique

Although the spine is a common target for osteoarticular tuberculosis (OAT), peripheral involvement in this case underlines the polymorphism of OAT in children. It illustrates a case of OAT strictly located to the synovial membranes, which usually occurs in one-third of OAT cases. In addition, MRI showed tenosynovitis of the quadriceps. The child presented with unilateral oligoarthritis instead of chronic insidious monoarthritis or symmetrical oligoarthritis as usually described in pediatric OAT. When available, MRI is the best way to evaluate OAT lesions. Mycobacterium tuberculosis can be isolated from sputum, gastric aspiration, and joint fluid or synovial biopsy. Histological lesions can reveal advanced tuberculosis with the presence of caseous follicular lesions. Rapid bacterial detection using polymerase chain reaction remains insufficiently useful in those situations. The recommended therapeutic regimen consists of 3 months with four antitubercular agents (rifampicin, isoniazid, pyrazinamide, and ethambutol) followed by 9 months of a dual therapy (isoniazid, rifampicin).