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Biomedical subjects

J L Vezina

Publications and source records attributed to J L Vezina.

At least 19 recordsLinked to original sources
PubMed1991

[Current technique of myelography].

Myelography performed with fine needle technique has become virtually innocuous and can be more liberally used in conjunction with CT to produce the CT-myelogram, a product of remarkable diagnostic precision. The authors contention is based on a series of 1,357 consecutive myelograms or CT-myelograms recently performed using exclusively 26-gauge spinal needles.

Adolescent↗
PubMed1989

Outpatient myelography with fine-needle technique: an appraisal.

Postmyelography headaches are produced mostly by CSF leakage at the dural puncture site and are therefore largely dependent on the size of the needle used. Our study of 300 consecutive outpatients who had lumbar myelograms performed with 25- and 26-gauge spinal needles shows that the procedure has become virtually innocuous. We recommend that 26-gauge spinal needles be widely adopted as the standard for fluoroscopically controlled intrathecal injections of contrast material.

Adolescent↗
PubMed1985

[Late post-traumatic syringomyelia. Discussion apropos an atypical case].

Late post-traumatic syringomyelia is uncommon, the clinical signs appearing several years after severe trauma to the cervical spinal cord. It is due to progressive cavitation in the spinal cord. In the case reported here progress was atypical because there were no immediate neurological signs and the symptoms of syringomyelia developed only 3 weeks after injury. Several possibilities are open to discussion. Was the trauma responsible for the syringomyelia? Did it cause an aggravation of a pre-existing hydromyelia or were both lesions purely coincidental? A silicon tube draining the cavity in the cord to the subarachnoid space resulted in a real improvement in the neurological condition.

Adult↗
PubMed1983

[Value of digital subtraction angiography in cerebrovascular diseases].

Digital Angiography was done on 1 000 patients with cerebral vascular diseases at the cervical or cerebral level. This was done by intravenous injection in 800 cases and by intra-arterial injection in 200 cases. The study of the cervical carotid bifurcation is favorably compared to the one obtained by the conventional arteriography. The intracranial aneurysms of 1 centimeter are well visualized and this method is valid to eliminate a giant aneurysm before transsphenoidal surgery. The digital angiography also allows the study of venous and sinus malformations. The postoperative controls of the aneurysms, carotid endarterectomies and extra-intracranial bypass are perfectly shown and can be repeated. The comparative study between the intravenous digital angiography and the conventional angiography have shown a good correlation between both tests in 80% of the cases. This rate can be risen by intra-arterial injection. It is a non-invasive method, reliable and economical with very little complications. This test can be done on an external basis and repeated if necessary. The disadvantages are the overlapping of the vessels, the necessity of the strict immobilisation of the head and the difficulty of evaluating the vessels whose diameter is inferior to 1 mm.

Angiography↗
PubMed1981

[Prolactinoma: radiologic appearance of the sella turcica].

Radiologic studies of the sella turcica have been performed in 355 patients operated on for prolactinomas. According to our classification, the grading of the sella in 300 females was normal in seventeen, grade I in one hundred and seventy-eight, grade II in eighty-seven, grade III in nine and grade IV in nine. A suprasellar expansion was evidenced in twenty-four of these patients. In 55 men, the sella was of grade I in eight, grade II in thirty-nine and grade IV in eight. Twenty-three had a suprasellar expansion. The early radiological diagnosis of a prolactin-secreting microadenoma became important when the hypophyseal origin of the clinical syndromes associated with hyperprolactinemia was demonstrated. Prolactinomas can usually be diagnosed by polytomography when they have reached 4 mm in size. Subtle bony changes such as cortical thinning, lateralized blistering or bulging of the floor are reliable radiological signs when associated with a biologically confirmed clinical syndrome.

Adenoma↗
PubMed1979

Bonnet-Dechaume-Blanc syndrome.

A 16 year old girl presenting the visual disturbances was found to have a right retinal arteriovenous communication. The provisional diagnosis of Bonnet-Dechaume-Blanc syndrome was confirmed by angiographic demonstration of ipsilateral orbital and intracranital arteriovenous malformations.

Adolescent↗
PubMed1976

Prolactin-secreting pituitary microadenomas.

Prolactin-secreting pituitary microadenomas have been surgically selectively removed in 20 patients presenting an amenorrhea-galactorrhea syndrome, hyperprolactinemia and radiological modifications of the sella turcica. In these patients, the sella was of normal size but hypocyloidal tomography evidenced subtle changes characterizing pituitary microadenomas. The surgical intervention has been based on the twin criteria of hyperprolactinemia and sellar findings.

Adenoma↗
PubMed1976

Transsphenoidal neurosurgery of intracranial neoplasm.

Because of the benign, rapid, and nontraumatizing nature of the extracranial transsphenoidal approach to the base of the skull, this procedure is indicated as the method of choice in nearly all cases of surgery for pituitary fossa and parasellar region access. Some of the largest pituitary chromophobe adenomas with voluminous suprasellar expansion have been successfully excised from below, as well as some calcified tumors, craniopharyngiomas, Rathke's pouch cysts, chordomas, chondromas, and meningiomas. At the other extreme, the smallest intrapituitary microadenomas (as little as 3 mm in diameter) were selectively removed under optic magnification with the surgical microscope. This method is now the most appropriate for the treatment of oversecreting pituitary disorders, even with normal-sized sella turcica (acromegaly - Cushing -galactorrhea). Early detection of intrapituitary microadenoma allows achievement of its selective excision with preservation of the normal gland. Thus, the ideal goal can be achieved by immediate biological cure of hyperpituitarism with preservation of other pituitary functions, resulting in normal physiological eupituitarism.

Acromegaly↗