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Biomedical subjects

B Verbeeten

Publications and source records attributed to B Verbeeten.

At least 19 recordsLinked to original sources
PubMed1992

Memory complaints, memory disorders and focus localization in patients with partial epilepsy.

Our study aimed at analysing effects of epileptic foci on memory function in patients with partial epilepsy. Twenty-eight patients with spontaneous memory complaints and psychometrically established memory disorders were assessed by 21-channel electroencephalography recorded both during cognitive testing and during 99mTc-HMPAO single photon emission computed tomography (SPECT). Computed tomography (CT) was performed on the same day. None of the epilepsy-related factors (seizure type, seizure frequency, type of epilepsy, age at onset of the seizures, type of antiepileptic treatment) could be related directly to severity or type of memory impairment (classified into the categories 'global', 'verbal' and 'non-verbal'). Remarkably, this study found no significant relationship between EEG focus localization and severity of measured memory impairment. Most areas with hypoperfusion on the SPECT were found in the group with global (severe) amnesia, typically with a right frontal localization. Abnormalities on CT were predominantly found in the same group, however, with a right-sided parietal localization. An unanticipated finding was that the majority of temporal CT and SPECT lesions were found in the group with relatively better memory performance.

Adult↗
PubMed1992

Focus localization in patients with partial epilepsy with 99Tcm-HMPAO SPECT under continuous surface EEG monitoring.

Our study was aimed at determining the validity of 99Tcm-HMPAO single photon emission computed tomography (SPECT) in the localization of the epileptogenic focus by correlating this diagnostic method with other auxiliary investigations such as surface EEG and X-ray transmission computed tomography (CT). Twenty-eight patients with partial epilepsy and spontaneous memory complaints were assessed with a 21-channel EEG recorded during psychometric evaluation of the memory complaints and with a 12-channel EEG during 99Tcm-HMPAO SPECT. No significant agreement was observed for total focus localization by the two EEGs, CT or SPECT. The EEGs were highly reproducible. Frontal and temporal pathology on CT resulted in frontal and temporal cold spots on SPECT on the same side in six patients. In addition, SPECT demonstrated frontal, temporal or posterior temporal-inferior parietal cold spots in nine patients without accompanying pathology on CT. It is concluded that CT and SPECT may provide complementary anatomical and functional information, respectively, to the EEG. Furthermore, SPECT may be complementary to CT in visualizing functional deficits without an anatomical correlate. The value of SPECT studies in partial epilepsy may be improved by increasing the resolution of the SPECT system and by simultaneous EEG monitoring.

Adult↗
PubMed1991

Intradiploic epidermoid cysts of the bony orbit.

Epidermoid cysts originating within the diploic space of the bony orbit are rare. The authors retrospectively studied four patients with an intradiploic epidermoid cyst of the orbital bones to investigate the clinical and the computed tomographic (CT) findings. The clinical presentation was dependent on the location of the slowly expanding epidermoid cyst. The sphenoid bone was involved in three patients and the frontal bone in one patient. Proptosis caused by intraorbital extension of the mass was the most common presenting sign. The findings on high-resolution CT scans appeared to be specific for intradiploic epidermoid cysts. The typical sclerotic margin, which is diagnostic of intradiploic epidermoid cysts, can be demonstrated by CT scans with a bone window setting.

Adolescent↗
PubMed1991

Leukoaraiosis and ventricular enlargement in patients with ischemic stroke.

We studied the relationship between ventricular size and nonspecific periventricular lucency on computed tomograms (leukoaraiosis) in 192 patients with ischemic stroke. Leukoaraiosis did not occur in 21 patients less than 50 years of age; ventricular size could not be measured in an additional 29. Leukoaraiosis was graded from 0 to 4 on a semiquantitative scale; bicaudate, frontal horn, and posterior horn indices were used as measures of ventricular size. Patients with leukoaraiosis were older (difference between means 7 years, t = 5.3, df = 140, p less than 0.0001) and had larger bicaudate indices (difference between means 0.023, t = 3.54, df = 140, p = 0.0007) than patients without leukoaraiosis. Multiple regression analysis demonstrated that the effects of age and leukoaraiosis were independent. No effect of lesion type (cortical or lacunar infarct, or both) on bicaudate index could be demonstrated. Larger values for the bicaudate index were associated with a predominantly anterior location of leukoaraiosis. The frontal horn and occipital horn indices increased with age, but we could not find an effect of leukoaraiosis on these indices.

Aged↗
PubMed1991

rCBF-SPECT in brain infarction: when does it predict outcome?

We prospectively studied 26 patients with ischemic stroke within 24 hr, after 2 wk, and after 6 mo with thallium-201-diethyldithiocarbamate single-photon emission computed tomography (SPECT) and neurologic and functional assessments. The admission flow deficits correlated with outcome. The admission and 6-mo scores correlated with clinical conditions at each time. At 2 wk, the flow deficits were smaller and did not correlate with clinical parameters. Nor did the presence or absence of hyperfixation of the radiopharmaceutical. Six months after the infarct, the flow defect had decreased in 9 of 15 patients in whom three serial scans were available, with better clinical improvement than in the remaining six whose flow deficits increased. More patients in the first group had been treated randomly with the calcium-entry blocker flunarizine. SPECT imaging of rCBF within 24 hr after stroke correlates with clinical outcome and condition, whereas rCBF imaging at 2 wk after the stroke shows no clinical correlation.

Aged↗
PubMed1990

Relation of leukoaraiosis to lesion type in stroke patients.

Nonspecific periventricular white matter lucencies on computed tomograms (leukoaraiosis) were found in 141 (38%) of 367 patients with ischemic or hemorrhagic strokes. Patients with leukoaraiosis were significantly older than those without it and were significantly more likely to have hypertension, diabetes mellitus, general vascular disease, and lacunar infarcts on computed tomograms but were less likely to have cortical infarcts. Because many of these variables may be mutually dependent, we performed a logistic regression analysis examining all clinical and computed tomographic variables. The analysis demonstrated that increasing age, lacunar infarcts, and hemorrhages were significant determinants of leukoaraiosis; cortical infarcts were also significantly, but negatively, correlated with leukoaraiosis. In patients with hemorrhages, leukoaraiosis occurred significantly more often when aneurysms or arteriovenous malformations were not demonstrated. These findings suggest that in patients with cerebrovascular disorders leukoaraiosis is associated with small-vessel disease.

Adult↗
PubMed1988

Urinary tract malakoplakia with extension into the retroperitoneum with secondary gastrointestinal involvement.

A rare case of malakoplakia of the urinary tract with diffuse retroperitoneal extension is presented. Sonographically guided cytologic puncture revealed the pathologic diagnosis. The splenic flexure of the colon and the stomach appeared to be secondarily involved in the inflammatory retroperitoneal tumor. The relative role of the various imaging modalities in defining retroperitoneal extension of the disease is illustrated, with a special reference to computed tomography and endosonography. After antimicrobial treatment and left nephrectomy, partial regression of the retroperitoneal mass was documented.

Adult↗
PubMed1988

Electromyographic and computed tomographic findings in five patients with monomelic spinal muscular atrophy.

Five patients with monomelic spinal muscular atrophy are described. Clinical features included insidious onset of wasting and weakness of one limb, lack of involvement of the cranial nerves, brain stem, pyramidal tracts and sensory system, and a stable condition over a period of 4-20 years. Clinical findings, electromyography and/or muscle biopsy were consistent with anterior horn cell lesion. Central cavities were excluded by magnetic resonance imaging studies of the spinal cord. Computed tomography of skeletal musculature and electromyography indicated more diffuse lower motor neuron involvement by revealing abnormalities in clinically unaffected muscles in 4 of the 5 patients. Myokymic discharges were found in the affected limb of 1 patient.

Adolescent↗
PubMed1986

Pseudohypertrophy of the calf following S1 radiculopathy.

Development of unilateral calf enlargement following chronic S1 radiculopathy occurred in a 39-year-old woman. Computed tomographic examination of the leg musculature showed that the calf enlargement was due to pseudohypertrophy, as the increased area in the posterior leg muscles showed a decrease in density.

Adult↗
PubMed1985

Detection of basilar artery thrombosis by CT.

A case is presented with distal basilar artery occlusion diagnosed by computed tomography (CT). The normal basilar artery imaged on plain CT scans has an attenuation value not higher than that of whole blood. If the CT attenuation value of the vessel is higher than that of blood, basilar artery occlusion is probably present. In the case presented the cause was traumatic thrombo-embolic occlusion of the basilar artery.

Adult↗
PubMed1985

Some anatomical variants and pitfalls in computed tomography of the trachea and mainstem bronchi. I. Mucoid pseudotumors.

472 computed tomographic (CT) examinations in 448 patients were reviewed for mucoid pseudotumors. In 10 patients (2%), an intraluminal density was indirectly proven to be mucous material by negative bronchoscopy and/or repeat CT. Mucoid pseudotumors can easily be differentiated from CT artifacts and from intraluminal neoplasms with extraluminal extension. Differentiation from true intraluminal neoplasmata may be difficult. No definite diagnostic criteria can be proposed since there were no true intraluminal neoplasms present in this series. Nonetheless, several characteristic radiological features of mucoid pseudotumors are discussed. When a potential mucoid pseudotumor is found in a CT examination either the CT scans in question should be repeated after vigorous coughing or an intraluminal neoplasm should be excluded by bronchoscopy. Starting from the CT examination, in the case of bronchogenic carcinoma of the central airways, the intraluminal extent of the tumor might be overestimated due to mucous material proximal to the tumor.

Adolescent↗
PubMed1985

Some anatomical variants and pitfalls in computed tomography of the trachea and mainstem bronchi. II. Compression or anatomical variants?

472 computed tomographic (CT) examinations in 448 patients were reviewed for depression of the wall of the trachea and mainstem bronchi. Depression was defined as a neutral term, not indicating pressure exerted upon the wall. Such depressions appeared to occur very frequently as a variant. Special attention is paid to the so-called azygos vein indentation. The most marked depression variants in our series are reproduced. When a depression is found in contiguity with a pathological mass and does not exceed the range of the variants, one cannot be sure that the mass is indeed the cause of this depression. In patients with bronchogenic carcinoma, depression of the wall of the trachea or mainstem bronchus seems to be no better sign for the metastatic nature of lymphadenopathy than size per se.

Azygos Vein↗
PubMed1977

Radiological diagnosis of pontine angle tumours.

The following methods of radiological examination are suitable aids in the diagnosis of pontine angle tumours: plain radiographs and tomograms of the petrosal bone, cisternography of the pontocerebellar cistern with positive- und negative-contrast media, vertebral arteriography and computer tomography. In some 80% of cases of pontine angle tumour, plain X-rays and tomograms can disclose changes. In the case of vestibulocochlear neurinoma confined to an intracanalicular localization, only cisternography with a positive-contrast medium supplies diagnostic information. Cisternography with a negative-contrast medium is a suitable method of radiological examination in the case of larger vestibulocochlear neurinomas, which protrude into the pontocerebellar cistern, and also for the remainder of pontine angle tumours. The technique we use in this cisternography is described and evaluated with reference to 28 patients.

Adult↗
PubMed1977

The value of computer tomography, orbital venography and carotid angiography in the diagnosis of exophthalmos.

On the bases of 25 patients examined by orbital venography, computer tomography, (CT scanning) and sometimes carotid angiography, the diagnostic value of each of these methods is evaluated. The data obtained are compared with the corresponding information from the literature. In view of the findings it can be stated that CT scanning can be regarded as the primary neuroradiological examination in cases of exophthalmos. Orbital venography gives supplementary information in cases of varices and venous malformations. Angiography is the method which supplies the maximum of information when cavernous sinus fistulae are clinically suspected. With reference to 3 patients it is explained that in such selective angiography of the internal and external carotid and the vertebral artery is indicated.

Adolescent↗
PubMedDate not supplied

Dermolipoma: characteristic CT appearance.

Dermolipomas are choristomas usually located at the external canthus. Clinically they can be confused with dermoid cysts. Preoperative diagnosis of a dermolipoma is important because the surgical approach is less aggressive than for dermoid cysts. We describe the clinical aspects of ten patients with a dermolipoma and demonstrate the posterior extension of these lesions by CT.

Adipose Tissue↗