[Isolated muscular tuberculosis in dermatomyositis treated with corticosteroids. Developing outbreak of dermatomyositis under rifampicin treatment. 2 cases].

The authors report two cases of muscular tuberculosis in patients with dermatomyositis treated with steroids. Antituberculous therapy with Rifampicin led to a severe relapse of the dermatomyositis in both cases, suggesting enzymatic induction inhibiting the action of the steroids.