[Lumbar lateral recess and intervertebral foramen. Radio-anatomical study]. / Récessus latéral et foramen intervertébral lombaire. Etude radio-anatomique.

The recent developments in Computed Tomography (CT) and Magnetic Resonance Imaging (MRI) allow an accurate analysis of the anatomical structures of the lateral recess and of the neural foramen (vertebral body, pedicle, zygapophyseal joints, ligamentum flavum, intervertebral disk) and their contents (spinal ganglion, nerves roots, foraminal veins, surrounding fat). The aim of this study is 1) to describe the normal anatomy and variants of the lateral recess and of the lumbar neural foramen, and 2) to present the main diseases involving this anatomical area.

[Cerebral localizations of non-Hodgkin's malignant lymphoma. Contribution of x-ray computed tomography]. / Localisations cérébrales des lymphomes malins non hodgkiniens. Apport de la tomodensitométrie.

At the present time, CT scan imaging occupies an essential place in the diagnostic approach and course of cerebral non-Hodgkin's malignant lymphoma. Results of CT scan investigations are reported in 17 patients, 8 with primary and 9 with secondary lymphoma. The lesions observed, hypo-, iso- or faintly hyper-dense, took-up contrast almost constantly in an intense and well limited homogeneous manner. The subependymal infiltration noted was suggestive of the disease particularly since it was often associated with a paraventricular localization in the white substance, corpus callosum or central gray nuclei. However, no correlation existed with the primary or secondary nature or histologic type of lymphoma, and histopathologic confirmation was necessary from surgical biopsy specimen. Appearances of primary and secondary lymphoma are superimposable, apart from certain cases with co-existing secondary lymphoma and bone lysis or a contiguous endocranial tumor. Follow-up CT scan imaging confirms clinical remission, or recurrence raising the problem of radionecrosis.

[Digital subtraction angiography in ischemic cerebrovascular accidents]. / L'angiographie numérique dans les accidents vasculaires cérébraux ischémiques.

Recent advances in computer and radiological technology have permitted reassessment of intravenous angiography in the evaluation of cerebrovascular disorders. Although digital subtraction angiography is a relatively new technique, it has rapidly gained a widespread acceptance. It has extended the use of angiography to outpatients and to people in whom conventional angiography is contraindicated. This reliable, safe, and relatively noninvasive technique offers the user two benefits: real-time subtraction and enhanced image quality. The system allows angiographic evaluation of the extracranial and intracranial vessels by means of intravenous injection of contrast material. Extracranial studies clearly demonstrate stenoses and occlusions of the major cervicocephalic arteries. Intracranial studies usually detect major cerebrovascular occlusions and provide insight into the collateral flow patterns. Intravenous digital subtraction angiography permits accurate assessment of cervicocephalic vessels after surgical repair. Although intravenous digital subtraction angiography obviates the need for conventional angiography in many cases, movements from the patients, or superimposition of vascular structures can substantially degrade the quality of the images. Digital subtraction angiography with intra-arterial injection of contrast medium will be contemplated in patients with poor intravenous digital subtraction angiography studies prior to surgery.