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Biomedical subjects

W O Bank

Publications and source records attributed to W O Bank.

At least 55 records · Page 3Linked to original sources
PubMed1978

Metrizamide demonstration of the subarachnoid space surrounding the optic nerves.

Intrathecal instillation of metrizamide has provided a useful tool for the in vivo evaluation of smaller structures adjacent to or within the subarachnoid cisterns. The authors report a case in which metrizamide filled the thin subarachnoid space surrounding the optic nerve in its course through the orbit. The finding appears to be infrequent, however, since it was not observed in any instance in a review of 80 metrizamide computed tomographic cisternograms in patients with normal intracranial pressure.

Adult↗
PubMed1978

An evaluation of current diagnostic radiologic modalities in the investigation of acoustic neurilemmomas.

The radiologic investigation of patients with suspected acoustic neurilemmomas may include specialized plain films, thin-section tomography, CT scanning with intravenous contrast enhancement, Pantopaque cisternography, radionuclide scanning, angiography, and pneumoencephalography. Recently we have used intrathecally enhanced (Amipaque)2 CT cisternography tostudy the cerebellopontine angles and fourth ventricle. An assessment is made of the differential diagnostic value and limitations of radiologic modalities both in tumor detection and in accurate localization. A protocol designed to optimize use of the available radiologic modalities is projected from 30 patients with acoustic neurilemmomas.

Angiography↗
PubMed1978

Cerebral ischemia. I. Current angiographic techniques, complications, and safety.

The angiographic evaluation of the transient ischemic attack has been technically difficult, time consuming, and complication prone because of underlying arteriosclerosis and other medical diseases. The examination described depends upon small soft catheters, dynamic fluoroscopy for positioning, and selective magnified views of the arteries needed for surgical planning. Five basic views are exposed. On the side of clinical interest, a lateral view of the head and neck, a frontal view of the head, and a fluoroscopically positioned view of the carotid bifurcation are obtained; on the other side the frontal view is omitted. A total of 662 consecutive studies were performed on 603 patients without death or permanent strokes. The only permanent complication was a partial radial nerve palsy.

Cerebral Angiography↗
PubMed1977

Computed tomographic diagnosis of suprasellar masses by intrathecal enhancement.

Ten suspected suprasellar mass lesions were evaluated by CT cisternography (CTC). In each case the cisterns could be defined. Suprasellar mass lesions were found in six. Precise assessment of the anterior, lateral, posterior, and superior extent, made by metrizamide CTC, was verified at surgery. In two masses the intravenously enhanced scan was not diagnostic, while a lesion was visualized by intrathecal (metrizamide) CT. The major diagnostic entity was an enlarged third ventricle. When a chiasmic lesion is suspected and the conventional scan is negative, metrizamide CTC is the examination of choice.

Cerebral Ventriculography↗
PubMed1977

Metrizamide computed tomography cisternography: pediatric applications.

The methodology and clinical use of metrizamide (Amipaque) computed tomography (CT) cisternography are described as applied in the cases of 22 children with morphologic and physiologic abnormalities affecting the cranial portion portion of the central nervous system. In contrast to pneumoencephalography, CT cisternography affords equivalent or superior visualization of the basal cranal subarachnoid spaces with simpler technique and low morbidity. Intrathecal metrizamide enchancement in children causes a very low incidence of side effects.

Adenoma, Chromophobe↗
PubMed1977

Posterior fossa extraaxial cyst: diagnosis with metrizamide CT cisternography.

This study describes a new technique for the study of posterior fossa extraaxial cysts. Using metrizamide (Amipaque) CT cisternography, a rapid, simple, low morbidity method is now available which gives both anatomic and physiologic information that may obviate the need for pneumoencephalography and angiography. Two cases are reported; in a third the diagnosis was definitively excluded. By doing serial CT scans following the intrathecal introduction of metrizamide, data concerning the diffusion characteristics of these cysts as well as the accompanying hydrocephalus are obtained.

Adult↗
PubMed1977

Intracranial biopsy assisted by computerized tomography.

A technique is described for biopsying intracranial tumors and aspirating cysts or abscesses using flexible non-metallic needle guides and computerized tomography a guidance system. Three cases are described in which this technique was used.

Adolescent↗
PubMed1977

Localization of velum interpositum AVM with metrizamide ventriculography and simultaneous stereoangiography. Case report.

The combination of metrizamide (Amipaque) ventriculography and vertebral angiography with stereoradiography provided precise localization of an arteriovenous malformation of the velum interpositum and an associated hematoma in the lateral ventricles that had not been detected by computerized tomography. This dual technique is recommended for precise localization of suspected intra- or periventricular lesions before surgery.

Adult↗
PubMed1975

Selective cerebral angiography through the axillary artery.

The femoral artery approach to cerebral angiography has become well accepted. Some patients, however, are not candidates for femoral catheterization because of severe arteriosclerosis. One hundred cerebral angiograms were performed in 88 severely arteriosclerotic patients, using No. 5 French polyethylene catheters and the axillary approach. The technique, degree of success, patient population, and their complications are described. This approach allows selective vertebral and internal carotid artery injections. Only one serious complication occurred, thrombosis of the axillary artery. Because of the time saved, this technique is often preferable to the femoral approach in severely arteriosclerotic patients.

Axillary Artery↗
PubMedDate not supplied

Simultaneous neurofibroma and schwannoma of the sciatic nerve.

The authors report a case of simultaneously occurring neurofibroma and schwannoma of the sciatic nerve and discuss the complementary aspects of MR and US. The schwannoma was well-defined and showed distal enhancement on sonographic evaluation, whereas the neurofibroma was ill-defined; both tumors were hypoechoic. T1- and T2-weighted MR images revealed similar signal characteristics of the two tumors, but intense enhancement following administration of gadolinium-DTPA distinguished the schwannoma from the neurofibroma.

Female↗
PubMedDate not supplied

Control and placement of intracranial microcatheters.

Balloon-tipped microcatheters allow flow-guided entry into small vessels and permit selective angiography, selective drug infusion, temporary or permanent vessel occlusion, and controlled deposition of tissue adhesives. However, active directive techniques are not usually successful with balloon microcatheters, and more passive flow-directed maneuvering must be learned. Three conditions may be encountered. In the first, the vessel to be entered is large and exits at a small angle from the parent vessel. Flow and momentum carry the microcatheter toward the goal. In the second, the abnormal vessel exists at a large angle but is larger than the continuing vessel. Inflating the balloon until it is larger than the continuing vessel will cause the flow to carry it around even sharp bends. In the third, the abnormal vessel is small and also exits at a large angle. Two balloons must then be used. The first occludes the larger mainline continuing vessel, while a second is injected; flow then carries the second around the bend.

Animals↗