[Postoperative echographic surveillance].

Real time ultrasonography can be used in the post operative period through a bone defect such as a craniectomy or laminectomy when their surface excess 6 cm2. It permits without moving the patient the study of the normal post-operative evolution of certain lesions such as abscess or ventricule enlargement, and the diagnosis of early post-operative complications. Tardive unfavourable anatomic evolution and/or recurrence can also be studied. In the future, the miniaturization of the probe will allow to extend this technique to smaller bone window.