[Norovirus gastroenteritis: frequent, often epidemic, with potentially severe complications]. / Gastroentérites à norovirus: fréquentes, souvent épidémiques et potentiellement graves.

Norovirus are the most frequent causes of epidemic gastroenteritis. Infections generally resolve spontaneously, but may lead to severe complications including death, or become chronic in immunocompromised hosts. Complications preferentially occur in immunocompromised hosts and their consequences are sometimes severe in vulnerable individuals living in confined spaces, such as healthcare settings. Norovirus have a high capacity to mutate. This and their capacity to persist in the water and on everyday objects of our surroundings favor the occurrence of epidemics. As a vaccination protective against most relevant strains is currently not available and in view of their high contagiousness, the prevention and control of the norovirus gastroenteritis remains a major clinical challenge.

[Imaging of infectious sacroiliitis]. / Imagerie des sacro-iliites infectieuses.

About 11 cases of various infectious sacroiliitis, the authors discuss the clinical, biological and radiological findings. Acute and subacute infectious sacroiliitis can be associated with another arthritis and are often accompanied by soft tissues lesions. Radiological investigations are very useful for the diagnosis, because of the unspecific clinical and biological findings. Radiography shows advanced osteoarticular remodelling but the subtle lesions are often unapparent. Bone scintigraphy shows a focal hypercaptation but is unspecific. Tomography and CT point out the erosions. With CT, soft tissues lesions are well demonstrated and a diagnostic punction with a fine needle is easily guided. MRI can indicate a bone marrow oedema and her quality for soft tissues lesions is well known; for these reasons, it could become a technic of choice.

[Synovial cysts of the hip. Diagnosis by x-ray computed tomography]. / Kystes synoviaux de la hanche. Diagnostic par tomodensitométrie.

Report of eleven synovial cysts of the hip, associated with osteoarthritis or rheumatoid arthritis, whose the diagnostic problems have been resolved by computed tomography. This technique is proving so efficient in the diagnosis of nature and extension that the other radiological examinations become useless.