Efficacy of rituximab in dermatomyositis and polymyositis refractory to conventional therapy.

We report one case of dermatomyositis and one of polymyositis refractory to several conventional inmunosupressive therapies, which present a response after treatment with rituximab, enabling steroid dose reduction and a prolonged remission.

[Follow up and prognostic value using magnetic resonance imaging in patients with spondyloarthritis treated with biologic agents].

Early diagnosis and assessment of the response to treatment in patients suffering from spondyloarthritis have always been challenging due to the lack of imaging techniques able to demonstrate spinal and sacroiliac inflammation. The last 2 years have seen important advances in the use of magnetic resonance imaging (MRI) for the study of spondyloarthritis. The possibility of quantification of inflammatory lesions using different scoring systems allows not only an early diagnosis, but the assessment of the response to several therapeutic agents, especially those known as «biological therapies».