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Ohara S, Crone NE, Weiss N, Lenz FA. Attention to a painful cutaneous laser stimulus modulates electrocorticographic event-related desynchronization in humans. Clin Neurophysiol 2004; 115:1641-52. [PMID: 15203065 DOI: 10.1016/j.clinph.2004.02.023] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/14/2004] [Indexed: 12/21/2022]
Abstract
OBJECTIVE To test the hypothesis that attention to painful cutaneous laser stimuli enhances event-related desynchronization (ERD) in cortical regions receiving nociceptive input. METHODS We used wavelet time-frequency analysis and bandpass filtering to measure ERD quantitatively in subdural electrocorticographic recordings while subjects either attended to, or were distracted from, a painful cutaneous laser stimulus. RESULTS ERD were observed over primary somatosensory and parasylvian (PS) cortices in all 4 subjects, and over medial frontal cortex in 1 subject. Laser-evoked potentials were also observed in all 3 regions. In all subjects, ERD was more widespread and intense, particularly over PS, during attention to laser stimuli (counting stimuli) than during distraction from the stimuli (reading for comprehension). CONCLUSIONS These findings suggest that pain-associated ERD is modulated by attention, particularly over PS. SIGNIFICANCE This study suggests that thalamocortical circuits are involved in attentional modulation of pain because of the proposed role of these circuits in the mechanisms of ERD.
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Niddam DM, Yeh TC, Wu YT, Lee PL, Ho LT, Arendt-Nielsen L, Chen ACN, Hsieh JC. Event-related functional MRI study on central representation of acute muscle pain induced by electrical stimulation. Neuroimage 2002; 17:1437-50. [PMID: 12414283 DOI: 10.1006/nimg.2002.1270] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Although pathological muscle pain involves a significantly larger population than any other pain condition, the central mechanisms are less explored than those of cutaneous pain. The aims of the study were to establish the pain matrix for muscle pain in the full head volume and, further, to explore the possibility of a functional segregation to nonpainful and painful stimuli within the area of the parasylvian cortex corresponding to the secondary somatosensory area. Additionally, we speculate that a randomization of nonpainful and painful stimuli may target specific structures related to stimulus salience. We used event-related functional magnetic resonance imaging (MRI) and the high sensitivity of the 3-T MRI scanner to study the central processing of acute muscle pain induced by intramuscular electrostimulation. Brief nonpainful and painful stimuli (1-ms duration, interstimulus interval = 12 s) were randomly applied to the left abductor pollicis brevis of 10 subjects. The data disclose a pain matrix for muscle pain similar to that for cutaneous pain. Individual analysis suggests separate representations within the area bounded by the upper bank of the Sylvian fissure (SF) and the circular sulcus of insula (CSI). Nonpainful stimulation activated the superficial parietal operculum adjoining the SF, while the painful condition additionally targeted the deeper parietal operculum bordering the CSI. Randomization of stimuli of different intensities likely introduces cognitive components that engage neural substrates servicing the appreciation of stimulus salience in the context of affect-laden pain imposition.
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Luetmer PH, Huston J, Friedman JA, Dixon GR, Petersen RC, Jack CR, McClelland RL, Ebersold MJ. Measurement of cerebrospinal fluid flow at the cerebral aqueduct by use of phase-contrast magnetic resonance imaging: technique validation and utility in diagnosing idiopathic normal pressure hydrocephalus. Neurosurgery 2002; 50:534-43; discussion 543-4. [PMID: 11841721 DOI: 10.1097/00006123-200203000-00020] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
OBJECTIVE We analyzed the reliability of a protocol for measuring quantitative cerebrospinal fluid (CSF) flow at the cerebral aqueduct and established the range of CSF flows in normal elderly patients, patients with Alzheimer's and other forms of dementia, and patients with idiopathic normal pressure hydrocephalus (NPH). METHODS A constant flow phantom was used to establish the accuracy of the CSF flow measurement. The clinical variability of the measurement was estimated by calculating the standard deviations and coefficients of variation of intra- and interobserver and intertrial data sets derived from three normal volunteers. A total of 236 patients were studied, including 47 normal elderly patients, 115 patients with cognitive impairment (9 with mild cognitive impairment, 46 with Alzheimer's disease, and 60 with other cognitive impairment), 31 patients in whom NPH was suspected but ultimately excluded, and 43 patients with a final clinical diagnosis of NPH. RESULTS The intraobserver, interobserver, and intertrial measurement variations of 6.4, 5.4, and 8.8%, respectively, were substantially smaller than the wide variation observed among subjects. There was no statistically significant difference in flow between normal elderly patients and patients with cognitive impairment (P = 0.91). When these populations were pooled, the average flow was 8.47 ml/min (standard deviation, 4.23; range, 0.9-18.5 ml/min). The average flow rate in patients with a final clinical diagnosis of NPH was 27.4 ml/min (standard deviation, 15.3; range, 3.13-62.2 ml/min). This was significantly higher than the flow rate in each of the other three groups (all, P < 0.001). CONCLUSION CSF flow measurements of less than 18 ml/min with a sinusoidal flow pattern are normal. CSF flow of greater than 18 ml/min suggests idiopathic NPH.
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Tisell M, Edsbagge M, Stephensen H, Czosnyka M, Wikkelsø C. Elastance correlates with outcome after endoscopic third ventriculostomy in adults with hydrocephalus caused by primary aqueductal stenosis. Neurosurgery 2002; 50:70-7. [PMID: 11844236 DOI: 10.1097/00006123-200201000-00013] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2001] [Accepted: 08/16/2001] [Indexed: 11/25/2022] Open
Abstract
OBJECTIVE To study prospectively the correlation between clinical outcome after endoscopic third ventriculostomy (ETV) and resistance to the outflow of cerebrospinal fluid (R(out)) and elastance in adults with hydrocephalus caused by primary aqueductal stenosis (AS). METHODS R(out) and elastance were measured in the subarachnoid space and intraventricularly before ETV in 15 consecutive patients. Three months after the ETV, the clinical effect was evaluated by standardized indices, and R(out) and elastance were measured. If symptoms persisted and the ETV was patent, shunt surgery was offered. The effect of the shunt operation and R(out) were measured after 3 months. RESULTS Four patients experienced excellent improvement, six improved slightly, and five had unchanged or deteriorated symptoms after ETV. R(out) before ETV did not correlate with outcome. R(out) decreased after ETV with correlation to the clinical effect; in the six patients who had shunt surgery, R(out) decreased further. High preoperative elastance correlated strongly with a good outcome and reduction of ventricle size. Elastance did not change after ETV. CONCLUSION R(out) intraventricularly and in the subarachnoid space could not predict the outcome of the ETV, but the reduction in R(out) correlated positively with clinical improvement. Preoperative elastance correlated positively with clinical improvement, and elastance was unchanged after ETV. Clinical improvement correlated positively with reduction in ventricle size.
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Ernst S, Ernestus RI, Kugel H, Lackner K. [MRI with cerebrospinal fluid measurement before and after endoscopic ventriculostomy and aqueductal stenosis]. ROFO-FORTSCHR RONTG 2001; 173:502-8. [PMID: 11471290 DOI: 10.1055/s-2001-14985] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
PURPOSE Evaluation of MR imaging and CSF flow measurement for planning and follow-up of neuroendoscopic third ventriculostomy in occlusive triventricular hydrocephalus. METHOD 17 patients with occlusive hydrocephalus due to idiopathic or neoplastic aqueductal stenosis were examined before and after surgery with cardiac-gated T2-weighted and cardiac-gated phase contrast cine sequences. The visibility of anatomic structures and the patency of the ventriculostomy were evaluated. RESULTS In all 17 patients, the relevant anatomic structures were visible. The cine sequence demonstrated occlusion of the aqueduct and patency of the ventriculostomy in all cases, even in patients with doubtful clinical patterns. CONCLUSIONS MR imaging with additional cardiac-gated cine sequences allows exact preoperative diagnosis of occlusive hydrocephalus as well as patient selection and planning for endoscopic third ventriculostomy. Non-invasive follow-up, especially in patients with a doubtful clinical pattern, is possible.
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Abubacker M, Bosma JJ, Mallucci CL, May PL. Spontaneous resolution of acute obstructive hydrocephalus in the neonate. Childs Nerv Syst 2001; 17:182-4. [PMID: 11305774 DOI: 10.1007/s003810000386] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Spontaneous resolution of acute hydrocephalus without aspiration of cerebral fluid is rare. In a neonate born at full term this has only been reported once before. We report on one further case that was caused by intraventricular haemorrhage (IVH). The probable mechanism is resolution of the acute haemorrhage in the region of the aqueduct, resulting in resolution of the hydrocephalus itself. The importance of considering conservative management of acute hydrocephalus in the clinically stable neonate is emphasised.
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Meier U, Zeilinger FS, Schönherr B. Endoscopic ventriculostomy versus shunt operation in normal pressure hydrocephalus: diagnostics and indication. MINIMALLY INVASIVE NEUROSURGERY : MIN 2000; 43:87-90. [PMID: 10943986 DOI: 10.1055/s-2000-8325] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
In contrast to the shunt operation the indication for an endoscopic ventriculostomy in patients diagnosed for normal pressure hydrocephalus is not scientifically established. Between September 1997 and December 1999 we operated on 48 patients diagnosed for normal pressure hydrocephalus. The diagnosis was established by means of the intrathecal lumbar or ventricular infusion test, the cerebrospinal fluid tap test and MRI-CSF flow studies pre- and postoperatively. In 37 patients (77%) we have implanted a ventriculo-peritoneal shunt, and in 11 patients (23%) we performed the endoscopic assisted third ventriculostomy. With our created NPH recovery rate and use of the clinical grading for normal pressure hydrocephalus created by Kiefer and Steudel we compared the operative results of both groups of patients. In patients with a pathologically increased resistance to CSF outflow in the lumbar infusion test a shunt implantation is indicated. Patients whose outflow resistance is increased in the ventricular infusion test but with a physiological lumbar infusion test are suspected for a functional aqueduct stenosis and should be treated by means of endoscopic assisted ventriculostomy.
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Green RL, Hutsler JJ, Loftus WC, Tramo MJ, Thomas CE, Silberfarb AW, Nordgren RE, Nordgren RA, Gazzaniga MS. The caudal infrasylvian surface in dyslexia: novel magnetic resonance imaging-based findings. Neurology 1999; 53:974-81. [PMID: 10496255 DOI: 10.1212/wnl.53.5.974] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVE To detect anatomic abnormalities of auditory association cortex in dyslexia by measuring the area of the perisylvian region known as the caudal infrasylvian surface(s) (cIS) in dyslexic and control subjects. BACKGROUND Several quantitative morphometric investigations of cortical areas in dyslexia have focused on the cIS, which encompasses the supratemporal plane and the inferior bank of the posterior ascending ramus of the sylvian fissure. Inconsistencies in the results of these studies may be attributable in part to the use of measurement methods that do not account fully for surface undulations of the cIS. METHODS The authors used an MRI-based surface reconstruction technique that models the curvature of the cerebral cortex in three dimensions to obtain whole-hemisphere and regional surface area estimates. Measurements were obtained in both hemispheres of eight right-handed male dyslexic subjects and eight right-handed male control subjects. RESULTS The cIS area of dyslexic subjects was significantly larger than that of control subjects, and this result was not attributable to a difference in whole-hemisphere surface area. Neither the dyslexic nor control subjects showed a left or right asymmetry in this region, although there was a trend toward less variance of the asymmetry scores in dyslexic subjects. CONCLUSIONS The gross anatomic organization of this region is different in dyslexic subjects, and elucidation of the precise nature of these differences may be aided by surface modeling techniques.
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Van Bogaert P, David P, Gillain CA, Wikler D, Damhaut P, Scalais E, Nuttin C, Wetzburger C, Szliwowski HB, Metens T, Goldman S. Perisylvian dysgenesis. Clinical, EEG, MRI and glucose metabolism features in 10 patients. Brain 1998; 121 ( Pt 12):2229-38. [PMID: 9874476 DOI: 10.1093/brain/121.12.2229] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
We studied 10 patients who had neurological disorders with a MRI-based diagnosis of perisylvian dysgenesis based on the fact that the parasagittal and centrifugal extremity of the sylvian fissure was abnormally mesial. This abnormality was bilateral in seven cases; in the other three patients, the contralateral sylvian fissure appeared either normal (two cases) or enlarged (open operculum). The perisylvian cortex had a polymicrogyric appearance in most patients. Potential aetiopathogenic factors were determined in four patients. In two of them, ischaemia at mid-gestation was ascribed to death of a co-twin in a context of monozygotic twinning. In the other two patients, who were siblings, genetic factors were suspected. Pseudobulbar palsy was found in eight patients and epilepsy in five patients. We used PET with [18F]fluorodeoxyglucose to test the hypothesis that, despite this clinical and MRI heterogeneity, regional cerebral glucose distribution could have common features in these patients. The analysis of PET data was performed by visual inspection in two cases and by using statistical parametric mapping (SPM) in eight patients compared with a control group. Segmented grey matter MRIs of seven out these patients were also analysed using SPM. We found that the abnormal perisylvian cortex had normal grey matter activity in eight patients and in the other two there was a heterogeneous pattern with areas of preserved metabolism and of decreased metabolism. Metabolic changes were also detected outside the polymicrogyric-like cortex; three patients had hypometabolic areas in cortical regions where the MRI appeared normal and had a normal intensity. When polymicrogyria extended into the white matter, this ectopic dysgenetic cortex was associated with a grey matter pattern within the white matter territory, and was detected by SPM as areas of PET hypermetabolism and MRI hyperintensity. In order to detect possible metabolic changes undetected by the individual analyses, the group of patients was compared with the control group. This comparison revealed bilateral hypometabolism in the frontal opercular cortex. We propose that these PET data be considered in light of the presumed cyto-architectonic pattern of perisylvian dysgenesis, i.e. polymicrogyria. In this malformation, two dense cell layers are separated by a necrotic sparse cell layer. We speculate that the amount of synaptic activity preserved in these dense cell layers depends on the importance and timing of the necrotic process; this hypothesis accounts for the large range of metabolic patterns found, from profoundly decreased glucose metabolism to nearly normal activity.
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Mangano FT, McAllister JP, Jones HC, Johnson MJ, Kriebel RM. The microglial response to progressive hydrocephalus in a model of inherited aqueductal stenosis. Neurol Res 1998; 20:697-704. [PMID: 9864733 DOI: 10.1080/01616412.1998.11740586] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Although gliosis has been reported to be a common and persistent feature in the white matter of hydrocephalic brains, no studies have identified the cell types that characterize this response. Therefore, the present study has employed histochemical methods to evaluate microglial cells in the brains of infant rats with inherited hydrocephalus. This strain of rats acquires hydrocephalus during late fetal stages due to aqueductal stenosis. Tissue from the sensorimotor and auditory cortices of 12- and 21-day-old hydrocephalic and normal H-Tx rats was processed and stained for the lectin microglial marker Griffonia simplicifolia (GSA-IB4). During the progression of hydrocephalus, GSA-positive cells exhibited three changes: (1) Cytologically, the cell bodies were enlarged, and their processes were thicker, longer and more numerous. These changes were most notable in the gray matter. (2) The packing density of GSA-positive cells was either increased or decreased, depending on the age of the animal and the severity of hydrocephalus. (3) Localized clusters of GSA-positive cells were conspicuous in the white matter of 12-day animals with mild hydrocephalus, and in the gray matter of 21-day animals with severe hydrocephalus. These results indicate that the microglial response is initiated during intermediate stages of hydrocephalus, and is not restricted to the periventricular white matter. These changes may signal other pathophysiologic events in the hydrocephalic brain, and demonstrate that microglia constitute one important element in the gliosis that accompanies hydrocephalus.
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Maeder P, Gudinchet F, Meuli R, Fankhauser H. Dynamic MRI of cerebrospinal fluid flow in endoscopic percutaneous ventriculostomy. Br J Neurosurg 1998; 12:18-22. [PMID: 11013642 DOI: 10.1080/02688699845456] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
Endoscopic percutaneous ventriculostomy (EPV) is a new technique to restore the flow of the cerebrospinal fluid (CSF) to the basal cistern in patients with non-communicating hydrocephalus (NCH). Cardiac gated MRI techniques have been applied to demonstrate normal and abnormal CSF flow in humans. The aim of this study was to evaluate the ability of a new multislice spin echo dynamic MRI technique and amplitude and phase reconstruction to demonstrate the impairment of CSF flow through the aqueduct preoperatively and to assess the patency of the ventriculostomy after surgery. Thirteen patients with NCH were studied with dynamic MRI before and after EPV using multiple sagittal multislice gated SE acquisitions to demonstrate the CSF flow. Nine patients were clinically improved by EPS, two remained unchanged and two deteriorated. The permeability of the ventriculostomy was confirmed in all patients. We think that MRI flow studies are useful to demonstrate the site of impairment of CSF flow and its aetiology preoperatively, and to assess the permeability of the ventriculostomy after surgery in a non invasive way.
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Baykan-Kurt B, Sarp A, Gökyiğit A, Tunçay R, Calişkan A. A clinically recognizable neuronal migration disorder: congenital bilateral perisylvian syndrome. Case report with long-term clinical and EEG follow-up. Seizure 1997; 6:487-93. [PMID: 9530947 DOI: 10.1016/s1059-1311(97)80026-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Congenital bilateral perisylvian syndrome (CBPS) is a recently described, neuronal migration disorder, characterized by pseudobulbar palsy, epilepsy and mental retardation and bilateral perisylvian dysplasia. A 15-year-old boy was diagnosed with CBPS according to the typical clinical, and magnetic resonance imaging (MRI) features. The patient was suffering from atypical absence seizures, repeating daily in spite of antiepileptic drug therapy, since age 7 years. He had also experienced rare generalized tonic-clonic seizures and complex partial seizures. Neurological examination showed severe restriction of tongue movements, severe dysarthria, dysphagia, facial diplegia, mild pyramidal signs and moderate mental retardation. A computed tomographic (CT) scan demonstrated bilateral perisylvian enlargement. The diagnosis was corrected with MRI after six years. Frequent irregular generalized spike and wave abnormalities and focal sharp and slow waves over the posterior regions of both hemispheres were shown by electroencephalograms (EEG). The patient was treated with Na-Valproate, carbamazepine and lamotrigine but did now show any significant change in seizure frequency in the eight-year follow-up period. Intractable seizures, mental retardation and particularly congenital pseudobulbar palsy suggest this congenital entity. Those patients who exhibit these typically clinical features, must have MRI.
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MESH Headings
- Adolescent
- Brain Damage, Chronic/congenital
- Brain Damage, Chronic/diagnosis
- Brain Damage, Chronic/physiopathology
- Cerebral Aqueduct/abnormalities
- Cerebral Aqueduct/physiopathology
- Dominance, Cerebral/physiology
- Electroencephalography
- Epilepsy/congenital
- Epilepsy/diagnosis
- Epilepsy/physiopathology
- Epilepsy, Complex Partial/congenital
- Epilepsy, Complex Partial/diagnosis
- Epilepsy, Complex Partial/physiopathology
- Epilepsy, Tonic-Clonic/congenital
- Epilepsy, Tonic-Clonic/diagnosis
- Epilepsy, Tonic-Clonic/physiopathology
- Evoked Potentials/physiology
- Follow-Up Studies
- Humans
- Intellectual Disability/diagnosis
- Intellectual Disability/physiopathology
- Magnetic Resonance Imaging
- Male
- Neuropsychological Tests
- Paralysis/congenital
- Paralysis/diagnosis
- Paralysis/physiopathology
- Syndrome
- Tomography, X-Ray Computed
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Blackmore CC, Mamourian AC. Aqueduct compression from venous angioma: MR findings. AJNR Am J Neuroradiol 1996; 17:458-60. [PMID: 8881239 PMCID: PMC8337980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Vascular compression as the cause of aqueductal stenosis is rare. In a 16-year-old girl with hydrocephalus, MR imaging provided evidence of aqueductal stenosis caused by a venous angioma in the tectum and midbrain. This indicates the usefulness of MR imaging for the evaluation of obstructive hydrocephalus.
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Honer WG, Bassett AS, Squires-Wheeler E, Falkai P, Smith GN, Lapointe JS, Canero C, Lang DJ. The temporal lobes, reversed asymmetry and the genetics of schizophrenia. Neuroreport 1995; 7:221-4. [PMID: 8742456 PMCID: PMC3160973 DOI: 10.1097/00001756-199512290-00053] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Mechanisms determining temporal lobe structural asymmetries may be involved in the pathogenesis of schizophrenia. To investigate the temporal lobes in familial schizophrenia, computed tomographic scans were obtained from 51 subjects (seven families). Enlargement of sylvian fissures and temporal lobe sulcal spaces was observed in family members with schizophrenia. The posterior one-third of the sylvian fissure was larger on the left side in subjects with schizophrenia, and larger on the right side in unaffected individuals. This disturbed pattern of posterior sylvian fissure asymmetry suggests that adjacent language regions may be affected in schizophrenia. An intermediate degree of disturbance in subjects who had schizophrenia-related illnesses or were obligate carriers suggests that genetic factors may be important determinants of temporal lobe asymmetries in familial schizophrenia.
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Di Rocco C, Iannelli A, Tamburrini G. [Late clinical manifestations of hydrocephalus associated with aqueductal stenosis]. Minerva Pediatr 1995; 47:511-20. [PMID: 8900560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Hydrocephalus associated with aqueductal stenosis is not uncommon after the 2nd year of life. In some patients, stenosis is due to slow-growing periaqueductal tumors that can only be revealed by magnetic resonance examination. We reviewed 31 cases of children with aqueductal stenosis and hydrocephalus diagnosed after the second year of life, and operated on in the Section of Paediatric Neurosurgery of UCSC between 1982 and 1993. Eighteen cases (Group I) had nonneoplastic aqueductal stenosis, while in 13 cases (Group II) it was demonstrated a periaqueductal tumor by NMR. Intracranial hypertension was the most frequent symptom at diagnosis in both groups. In Group I mental and growth retardation were frequent, while cerebellar signs were quite common in Group II. The treatment of choice for hydrocephalus was a V-P shunt. Tumors in Group II were not directly treated, because of their benign behaviour. Subdural hematoma was a relatively common shunt complication in these patients. In 2 cases we observed an atypic complication: patients developed an altered level of consciousness, upsight paresis and distony, without any sign of increased intracranial pressure, or cerebro-spinal fluid infection. One of these patients died; we treated the second patient with L-Dopa (Sinemet 150 mg/die); he progressively improved and had a complete remission of symptoms. Surgical mortality was nil; long-term mortality was 12.5%. In 76.1% of Group II patients we have not observed any tumor growth; 50% of Group I patients has still a complete remission of preoperative symptoms (follow-up 2-12 years).
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Kadowaki C, Hara M, Numoto M, Takeuchi K, Saito I. Cine magnetic resonance imaging of aqueductal stenosis. Childs Nerv Syst 1995; 11:107-11. [PMID: 7758008 DOI: 10.1007/bf00303815] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Cerebral aqueductal stenosis is one of the most common causes of congenital and acquired hydrocephalus, but the etiology, pathophysiology and cerebrospinal fluid (CSF) dynamics of aqueductal stenosis have yet to be clarified. Utilizing cardiac gated cine magnetic resonance (MR) imaging, we evaluated aqueductal configuration and pulsatile motion of brain and CSF flow stimulated by cardiac pulsation in five patients with non-tumoral aqueductal stenosis. Cine MR of four cases revealed obliteration of the aqueduct by thickening mesencephalic tectum, turbulent CSF flow in the III ventricle, and absence of flow-related signal void, which in all normal cases indicates CSF movement within the aqueduct. In the remaining fifth case, with proximal dilation of the aqueduct resulting from thinning of the tectum, distortion of caudal (distal) tectum related to pulsatile motion of the brain caused funnel-like narrowing of the aqueduct, leading to incomplete obstruction and the absence of upward CSF flow during diastole.
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Pascual-Castroviejo I, Martínez Bermejo A, López Martín V, Roche C, Pascual Pascual SI. Optic gliomas in neurofibromatosis type 1 (NF-1). Presentation of 31 cases. Neurologia 1994; 9:173-7. [PMID: 8024821] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
We present a series of 31 cases of optic glioma associated with neurofibromatosis type 1 in patients under 11 years of age. They represent 64% of all the optic gliomas seen in our service between September 1965 and September 1993. The optic nerves were affected in 25 cases (83%); 9 children (30%) had a isolated, unilateral tumor; 16 (53%) had involvement of the optic chiasm as well as of one or both optic nerves. In 6 cases (19%) only the chiasm was affected, with or without involvement of other intracerebral structures. A coincidental orbital plexiform neurofibroma was associated with a poor prognosis. Other complications included 8 cases (26%) presenting with slowly developing aqueductal stenosis requiring treatment with a shunt. High-resolution computed-tomographic scans provided well-defined images for the diagnosis of optic nerve glioma, but magnetic resonance imaging was the preferred procedure for the diagnosis of gliomas involving the chiasm and the optic tracts and radiations, particularly if there was no mass effect. In our patients, tumor growth was hardly noticeable during follow-up even up to 20 years, with no difference between patients who were treated with radiation and those who were not treated. However, endocrine disturbances developed in all cases subjected to radiotherapy, and were less frequent in untreated patients. Aqueductal stenosis was observed with similar frequency among both treated or untreated patients. Three patients died, two due to complications of hydrocephalus secondary to aqueductal stenosis and one because of respiratory problems due to compression of the hypothalamus and brainstem by the chiasm tumor. Two of the 3 patients who died had orbital plexiform neurofibroma.
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Abstract
Since hydrocephalus cannot be regarded as a single entity but is a group of illnesses whose pathophysiology remains unexplained in many aspects, its classification is particularly important. Various types of hydrocephalus are discussed with special reference to their etiology. The need for more research work is stressed.
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Montgomery CT, Winfield JA. Fourth ventricular entrapment caused by rostrocaudal herniation following shunt malfunction. Pediatr Neurosurg 1993; 19:209-14. [PMID: 8329307 DOI: 10.1159/000120733] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The subacute development of isolated fourth ventricle (IFV) is a recognized complication following shunting of the lateral ventricles for congenital and acquired hydrocephalus. We present an unusual case of acute IFV in a clinical setting which has not previously been described. Subsequent to rostrocaudal herniation caused by an obstructed frontally placed ventricular catheter, IFV developed in our patient 24 h following shunt revision, necessitating placement of an additional fourth ventricle shunt system. No signs of intraventricular hemorrhage or cerebrospinal fluid (CSF) infection were detected at the time of shunt revision and there was no documentation of similar events in the perinatal history. Dependent upon the actual underlying etiology of this child's hydrocephalus, we hypothesize that two mechanisms may have accounted for this unusual and precipitous development of IFV. Following rostrocaudal herniation and caudal shift of the brainstem, progressive edema in the pons developed. If communicating hydrocephalus was the primary etiology, then midbrain edema occluded the aqueduct of Sylvius, preventing retrograde flow of CSF to the shunt. A distinctly different mechanism for acute IFV must be invoked if aqueductal stenosis was the preexisting cause for congenital hydrocephalus. Following herniation, brainstem displacement and edema resulted in obliteration of the lateral pontine and ambient cisterns, preventing the normal rostral migration of CSF around and over the mesencephalon. Cerebellar tonsillar herniation with impaction of the tonsils into the foramen magnum may have also contributed to obstruction of fourth ventricular outflow in both settings. This unusual case of acute onset IFV is presented in detail. The underlying etiologies and clinical settings in which IFV may develop is reviewed as well.(ABSTRACT TRUNCATED AT 250 WORDS)
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Nakamura Y, Sato K. Role of disturbance of ependymal ciliary movement in development of hydrocephalus in rats. Childs Nerv Syst 1993; 9:65-71. [PMID: 8319234 DOI: 10.1007/bf00305310] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
We have developed a new in vitro method of quantitatively analyzing ciliary movement in the ependymal wall of the aqueduct in rats. An axial slice of the midbrain containing ependymal wall was placed in a culture dish filled with a culture medium containing latex beads 1 micron in diameter at a concentration of 10(7) beads/ml. The movement of the beads caused by flow of culture medium generated by the to-and-fro ciliary movement was recorded by a high speed video system attached to an inverted phase-contrast microscope. Ciliary movement was expressed by the speed of the latex beads (micron/s). Aqueductal ciliary movement in congenitally hydrocephalic HTX rats, congenitally hydrocephalic WIC-Hyd rats, and other normal rats was evaluated. The results suggest that in congenitally hydrocephalic WIC-Hyd rats the degree of hydrocephalus related strongly to the degree of ciliary dyskinesia, but in congenitally hydrocephalic HTX rats it did not. Considering this discrepancy, we attempted to see whether or not hydrocephalus was caused by artificial disturbance of ependymal ciliary movement in vivo. We found that continuous infusion of metavanadate, an inhibitor of ciliary movement, into the III ventricle of normal Sprague-Dawley rats for 7 days induced dilatation of the ventricular system. Although the question whether or not disturbance of aqueductal ependymal ciliary movement is related to the development of human congenital hydrocephalus is debatable, the results of the present in vitro and in vivo experimental investigations appear to suggest that the disturbance of ciliary movement in the aqueduct could at least be one of the factors contributing to the inducement of hydrocephalus in experimental conditions.
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Branco G, Goulão A, Ferro JM. MRI in aqueduct compression and obstructive hydrocephalus due to an ecstatic basilar artery. Neuroradiology 1993; 35:447-8. [PMID: 8377917 DOI: 10.1007/bf00602826] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
We describe a patient with an ecstatic basilar artery in whom MRI showed marked indentation of the floor of the third ventricle and backward displacement of the midbrain, probably causing aqueduct stenosis. It appeared likely that the associated hydrocephalus was due not only to any "water-hammer" effect, but also to occlusion of the aqueduct.
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Galeotti M, De Carolis P, Sacquegna T, Finizio FS. Non tumoural aqueductal stenosis with intermittent course. Case report after a six year follow up. J Neurol Neurosurg Psychiatry 1991; 54:1021. [PMID: 1800655 PMCID: PMC1014639 DOI: 10.1136/jnnp.54.11.1021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Satoh S, Aihara H, Fukawa O, Ikeda H. [A case with a diagnosis of apparent functional sylvian aqueductal stenosis]. NO SHINKEI GEKA. NEUROLOGICAL SURGERY 1991; 19:471-6. [PMID: 1852257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
A case with a presumptive diagnosis of a functional sylvian aqueductal stenosis is presented. The patient was a 64-year-old female, who suffered from progressive gait disturbance and dementia. On admission, CT-scan showed lateral and third ventricular dilatations. The pattern of the ventricular dilatation suggested an aqueductal stenosis. But CT-scan showed no tumorous lesion. RI-cisternography, RI-ventriculography, aqueductgraphy, and continuous monitoring of the intraventricular pressure of the third ventricle were performed in order to make a diagnosis. The results of these examinations led to the following conclusion. "Although there was no apparent mechanical obstruction or stenosis, the presence of circulatory failure of CSF, demonstrated apparent functional stenosis of the aqueduct sylvii." A VP-shunt operation was performed a month after her admission. Her symptoms improved remarkably.
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Lundar T, Nornes H. Determination of ventricular fluid outflow resistance in patients with ventriculomegaly. J Neurol Neurosurg Psychiatry 1990; 53:896-8. [PMID: 2266372 PMCID: PMC488253 DOI: 10.1136/jnnp.53.10.896] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Resorption of the ventricular fluid was studied by measuring ventricular fluid outflow resistance during steady state 1.5 and 5.0 ml/min infusions in 26 patients with substantial enlargement of the supratentorial ventricular system. This test may avoid unnecessary use of shunts, but a shunt could be introduced during the same procedure.
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