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Biomedical subjects

J F Meder

Publications and source records attributed to J F Meder.

At least 109 records · Page 6Linked to original sources
PubMed1989

Central sulcus patterns at MRI.

Radiologists can now use Talairach's bicommissural reference system and simple T-weighted sagittal magnetic resonance imaging (MRI) sections to recognize the central sulcus of the brain with its spatial features. In this study of 50 MRI examinations performed on normal subjects with contiguous 9 mm thick sagittal sections related to a standard proportional model that takes into account variations in the size and shape of the brain, the central sulcus could be identified on each section, despite its complexity on lateral projections and its frequent changes of course. By comparisons with the co-planar stereotaxic atlas of Talairach and Tournoux, it will be possible to localize the classical functional areas of the telencephalon.

Adolescent↗
PubMed1989

[Compressive vertebral hemangioma. The contribution of imaging technics to diagnosis and pretherapeutic evaluation].

From a serie of ten cases of compressive vertebral hemangiomas (H.V.C.), the interest of different imaging methods was evaluated. CT scan and M.R.I. were the best imaging modalities in most cases. A CT guided biopsy was necessary in three cases to differentiate from metastasis. Angiography permitted to establish the vascular patterns and to evaluate the usefulness of embolization performed in six cases.

Adolescent↗
PubMed1988

Symptomatic Rathke's cleft cysts; clinical and therapeutic data.

The authors report on a case of symptomatic Rathke's Cleft Cyst (RCC). The only clinical feature was headache. The cystic fluid was aspirated through a trans-sphenoidal approach. The postoperative course was uneventful. The rarity of symptomatic RCC (70 cases described in the literature; 30 operated patients) makes necessary the comparison of all data quoted in the different publications so as to define an appropriate attitude to treatment. It thus seems that the surgical procedure should be limited to an aspiration of the cyst contents through a trans-sphenoidal approach; such a procedure is more reliable than a craniotomy to avoid leakage of the cystic fluid into the subarachnoid space and possible postoperative aseptic meningitis. Some authors discussed the possibility of postoperative radiotherapy although only six patients developed recurrence of their clinical features several years after operation and also the efficacy of such a procedure has not been proved.

Adult↗
PubMed1986

[Management of cranial-injured patients in the era of the Emergency Medical Service and the scanner. Comparative epidemiologic study with a 12-year interval in the same department of neurosurgery, in the Paris region].

The authors present an analysis of the different data concerning the emergencies admitted in the Neurosurgical department of Sainte-Anne Hospital in Paris, during the one year-period extending from 1st June 1983 to 1st June 1984. These data have been compared to the corresponding findings established during 1972 in the same department. Traumatology appears to be a more and more limited activity among neurosurgical emergencies: 55% of admissions in 1972, 43% in 1983-84. The main characteristics of injured patients on admission have not changed: 65% are in a coma, 1.25 are operated in emergency, age distribution and types of lesion are identical. The sorting of the patients has improved: 25% of them were operated upon in 1972, 37% in 1983-84. Conveyance of injured patients has undoubtedly improved in quality during the last years; yet the duration of transport is still important, too important, even in Paris: 2 h 30 as an average-time. Another favorable factor has been the coming out of CT-Scan; it is of course of great help for diagnosis, but it must not let forget basic and fundamental therapeutic decisions.

Adolescent↗
PubMed1986

[Real-time ultrasonography in neurosurgery. Puncture of an intracranial hypoechogenic cavity].

The authors have been using real time echography in neurosurgical procedures since 1981: either for detection of a small sub-cortical tumor during a surgical operation, either for biopsy-guidance, or for puncturing a cavity (abscess, cyst or hematoma). The imaging is performed with a CGR SONEL 100 apparatus and two different frequency transducer elements: 3.5 MHz and 5 MHz. 56 patients underwent this technique; 22 times the lesion was hypoechoic: abscess give homogeneous, round hypoechoic image, often surrounded by a fine hyperechoic line; intracerebral hematoma produces an hypoechoic image after a 10 to 15 days evolution: compared to an abscess it then has a more hyperechoic irregular wave-like limit; tumoral-cyst echogenicity is very low; it can even be anechoic. If a stereotaxic structure exists, indication of real time echography must be limited to such stereotaxy contraindications: threatening intracranial hypertension, suppurated lesion, fragile patient. The technique has its limit: that is the small volume of the target-lesion (inferior to 10 mm); advantages must be emphasized: light procedure, satisfying confidence when considering the probe progression, sometimes better information than that of a CT-Scan examination especially for tumoral and cystic lesions.

Brain Abscess↗
PubMed1985

Ischemic strokes and oral contraception.

The authors describe the epidemiology and the physiopathological aspects of ischemic strokes in patients with a history of oestroprogestogen use. They then study their main radiological correlates: arterial infarcts at CT scan and angiographic non-specific lesions which can be included in the extremely wide framework of arteritis and, much more rarely, venous thrombophlebitis.

Arteritis↗
PubMed1985

CT in cerebral thrombophlebitis.

The authors report their experience based upon 56 cases of CT in cerebral thrombophlebitis. Direct signs of occlusion of the veins are infrequent and interest lies in the abnormalities due to brain edema or venous infarct. It is fundamental to recognize these infarcts as their evolution is favorable under treatment. Angiography is necessary to confirm the diagnosis of thrombophlebitis which can be only suspected on CT findings.

Brain↗
PubMed1985

Results of radiation treatment of medulloblastoma in adults.

From 1961 to 1982, 20 adults (greater than 16 years of age) were treated with radiation therapy following surgery for medulloblastoma. All patients received neuro-axis irradiation. Five patients received adjuvant chemotherapy. A 5- and 10-year survival rate of 78 and 55%, respectively, were achieved. Treatment failures were mainly a result of local recurrences, but also of metastases. One patient died of acute myeloid leukemia. One patient developed paraplegia. The survival rate was better in males (2 deaths out of 14) than in females (5 deaths out of 6). All the survivors are free of deficit or sequelae, except the patient with paraplegia.

Adolescent↗
PubMed1985

Giant intradiploic epidermoid cysts of the skull. Report of two cases.

The authors describe two cases of giant intradiploic epidermoid cysts of the cranial vault in which there was massive intracranial extension causing signs of neurological involvement. The very slow growth and the benign histological nature of these tumors explain their long preoperative evolution and the mild neurological signs in some cases. Roentgenographic and computerized tomography findings permit a correct diagnosis. Complete removal of these cysts and their capsules can be easily accomplished, despite their large size. Total removal of these cysts is associated with a very good long-term prognosis.

Epidermal Cyst↗
PubMed1984

[Neuroradiological examinations in psychiatry].

The search for an organic etiology in psychiatric conditions is greatly facilitated by modern radiological techniques. The most frequent etiologies demonstrated in the department of Radiology at the Sainte Anne Hospital were tumors, dementias, vascular disease and trauma with its attendant pathology.

Adult↗
PubMed1984

[Contribution of iodinated cisternography to craniocerebral computed tomography].

Computerized tomography is usually adequate to explore supratentorial lesions of the skull and brain. However, it is often inadequate for a detailed analysis of lesions of the base of the skull and their anatomical rapports. Opacification of the subarachnoid spaces by means of a contrast medium (computerized cisternography) has proved extremely useful in such cases. The contrast media utilized are tri-iodized, water-soluble compounds which are well tolerated. The technique and anatomical data of the method are described, and its applications in different fields of tumoral and non-tumoral pathology are discussed.

Arachnoid↗
PubMed1984

[Frontal osteoma with orbital extension. Apropos of a case].

Fronto ethmoidal osteoma are rare slow growth benign tumors. Exceptional ophthalmological and neurological complications can occur. The authors report a case of 32 years old man with eye compression by a giant frontal sinus osteoma. This lesion was responsible for a vertical diplopia and moderate proptosis. Plain skull X-Ray show a well defined opacity filling the whole left frontal sinus and C.T. scan delimited precisely orbital extension. Neurosurgical exposure enabled a complete extraction of the tumor and satisfying recovery. The authors have compared this case to those described in literature and insist on the importance of the pre-operative C.T. scan.

Adult↗
PubMed1983

Spinal metastases with neurological manifestations. Review of 600 cases.

The authors have studied 600 cases of spinal metastasis causing a neurological syndrome. The most significant statistical data are reviewed. The cases are examined according to clinical characteristics, type of primary tumor, site of lesion, and survival. Each of these factors influenced the choice and results of treatment. As a general rule, combined treatment (surgery and radiotherapy) was used. Preliminary surgery was performed as an emergency, designed to halt progression of the neurological syndrome and to prevent its more serious manifestations. The technique and usefulness of surgery are discussed for different situations and the short-term results of treatment are related to the various factors involved.

Adolescent↗