[The chronically limping child]. / Boiterie chronique de l'enfant.

Chronic limping in children usually indicates the presence of an underlying organic lesion. Clinical evaluation establishes the site and type of limping. It may suggest a neurological or mechanical lesion or locoregional etiology at the level of the hip or pelvis. Plain radiographs and ultrasound are firstline imaging techniques. The diagnosis may be delayed either due to ignorance of age-specific entities or false positive or negative results on plain films and ultrasound. MRI now plays a major role for diagnosis. Multiple potential underlying etiologies including trauma, infections, arthritides or tumors are best evaluated with MRI. The MRI examination should not be limited only to the hip joint.

[Value of MR imaging of the fetal kidney]. / Apport de l'IRM dans l'étude du rein foetal.

Sonography is the imaging modality of choice for initial evaluation of the fetus. However, the role of MR imaging for fetal evaluation is expanding. Based on a review of seven cases, the role of MRI to further characterize renal abnormalities detected at US, especially hyperechoic kidneys, is demonstrated.