[Magnetic resonance angiography: fields of exploration, main indications and limitations].

Magnetic resonance angiography (MRA) has become a widely accepted technique with regards to the other available noninvasive techniques in the diagnosis of vascular disease. This paper proposes a review of the different indications of this technique in arterial and venous diseases. Among several MRA pulse sequences, the most frequently used until today consisted of a time-of-flight technique which provided angiograms without any injection of intravascular contrast medium.

Detection of Mycobacterium paratuberculosis by polymerase chain reaction in children with Crohn's disease.

Mycobacterium paratuberculosis, the causative agent of Johne's disease (a chronic enteritis in ruminants), has been suspected to be involved in Crohn's disease. In this study, polymerase chain reaction was used to detect the presence of IS900 DNA sequences specific to M. paratuberculosis genomes in biopsies and surgical resections from 53 children with various gastrointestinal diseases and disorders.