[Unusual localization of spinal hydatid cyst]. / Localisation rare du kyste hydatique intra dural au niveau de la fosse posterieure.

We report one case of uncommon spinal hydatid cysts particular by its localization. It is intradural, localized with predilection in the big cistem cerebello-medullar. There is no involvement of adjacent vertebral discs and ligaments. We specify characteristic imaging features and polymorphism of this affection who can affect all anatomical structures. We emphasize MRI for diagnosis and follow-up in search for residual or recurrent lesions.

[MRI contribution in diagnosis of acute bone infarcts in children with sickle cell disease]. / Contribution de l'IRM au diagnostic des infarctus osseux aigus chez le drepanocytaire.

We analyse MRI findings of nine children with sickle cell disease having painful osseous attacks. The diagnosis of vaso-occlusive crisis was confirmed by negative bacteriology. MRI is useful for determining the anatomic site and the extent of acute infarcts. It gives a global view of osseous abnormalities, and contributes to differentiating acute infarcts from acute osteomyelitis.