[X-ray computed tomography in central pontine myelinolysis. 2 cases].

Two cases of central pontine myelinolysis were studied by computerized tomography (CT). One patient had chronic alcoholism, the other porphyria variegata; both initially presented with water-and-electrolyte disorders, notably hyponatraemia. The neurological disorders consisted of acute pseudobulbar syndrome which totally regressed within 15 days to 1 month.

[Ultrasonically guided biopsy of cerebral tumors].

The authors have not an installation for stereotaxic neurosurgery. In this condition they have used for 3 years real-time ultrasonography to guide the biopsy of deep-seated brain lesions. For adopting finally their method, a preliminary study of 31 patients has been performed.

[Transfontanelle cerebral echography].

Cerebral transfontanelle ultrasonography has been making many progress for ten years, with the grey scale of new echographs. We report here our experience. The technique is now standardized: we use a high resolution realtime scanner with a 5 MHz transducer placed directly over the fontanella.

[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.

[Peroperative spinal cord ultrasonography in neurosurgery].

Intraoperative spinal sonography is a new method of investigation. We are reporting 14 observations. The results of these explorations permit to describe the normal spinal sonography and a spinal ultrasonic semeiology.