Summary
The age distributions of communicating hydrocephalus (CH), pseudotumour cerebri (PC) slit-ventricle syndrome (SVS), and chronic subdural haematomas (CSH) were reviewed in the medical literature.
An age-related incidence was found: CH and CSH predominated in neonates less than 2 years and adults older than 55 years, while PC and SVS occurred mainly in older children and young adults. The latter two patient groups seem to show a greater resistance to ventricular dilatation in the presence of decreased CSF absorption. This may be related to larger volume and state of maturity of the cerebrum. On the other hand, neonates and the elderly more readily develop enlarged ventricles, in association with impairment of CSF absorption, or subdural fluid collections.
Factors including status of cranial sutures, cerebral atrophy, cerebral water content, degree of cerebral myelination, and glial cell composition, may contribute to the age-related incidence of the four disorders investigated. Similarly, the development of ventriculomegaly may depend upon cerebral elastic properties besides the pri mary disturbance of CSF dynamics.
The authors postulate that the size of cerebral ventricles in disorders of the cerebrospinal fluid (CSF) absorption is related to the elastic properties and volume of the brain. Furthermore, cerebral volume and elastic properties may also contribute to the age distribution of chronic subdural haematomas (CSH).
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References
Adams RD, Fisher CM, Hakim S, Ojemann RG, Sweet WH (1965) Symptomatic occult hydrocephalus with “normal” cerebrospinal fluid pressure. A treatable syndrome. N Engl J Med 273: 117–126
Ahlskog JE, O'Neill BP (1982) Pseudotumor cerebri. Ann Intern Med 97: 249–256
Amacher AL, Spence JD (1985) Spectrum of benign intracranial hypertension in children and adolescents. Childs Nerv Syst 1: 81–86
Ammiroti M, Eller T, Linton S (1986) Slit ventricles and shunt malfunction in an elderly patient. A case report. J Am Geriatric Soc 34: 545–547
Bjerre P, Lindholm J, Gyldensted C (1982) Pseudotumor cerebri. A theory on aetiology and pathogenesis. Acta Neurol Scand 66: 472–481
Black P McL (1980) Idiopathic normal pressure hydrocephalus. Results of shunting 62 patients. J Neurosurg 52: 371–377
Boddie HG, Banna M, Bradley WG (1974) “Benign” intracranial hypertension. Brain 97: 313–326
Bode H, Habler W, Sauer M (1984) The slit-ventricule syndrome — causes, procedures of differential diagnosis and therapeutic problems. Klin Pediatr 196: 40–43
Borgensen SE (1984) Conductance to outflow of CSF in normal pressure hydrocephalus. Acta Neurochir (Wien) 71: 1–45
Brawanski A, Sorensen N (1985) Increased ICP without ventriculomegaly. Diagnostic and therapeutic problems in a 1-year-old boy. Childs Nerv Syst 1: 66–68
Brenner A, Kalff R, Kocks W, Roosen C (1984) Slit-ventricle: clinical syndrome or radiological phenomenon? Neuropediatrics 15: 241 (Abst)
Bullens C, De Vries WAEJ, van Crevel H (1979) Benign intracranial hypertension: a retrospective and follow-up study. J Neurol Sci 40: 147–157
Cameron M (1978) Chronic subdural hematoma. A review of 114 cases. J Neural Neurosurg Psychiatry 41: 834–839
Carlton CK, Saunders RL (1983) Twist drill craniostomy and closed system drainage of chronic and subacute subdural haematomas. Neurosurgery 13: 153–159
Carteri A, Longatti PL, Gerosa M, Mazza C, Pasqualin A (1980) Complications due to incongrous drainage of shunt operations. Adv Neurosurg 8: 199–203
Chazal J, Janny P, Irthum B, Massini B (1983) Slit-ventricles. Report on 2 cases. Neurochirurgie 29: 327–331
Collmann H, Mauersberger W, Mohr G (1980) Clinical observations and CSF absorption studies in the slit ventricle syndrome. Adv Neurosurg 8: 183–186
Conner ES, Foley L, Black PM (1984) Experimental normalpressure hydrocephalus is accompanied by increased transmantle pressure. J Neurosurg 61: 322–327
Coppoletta JM, Wolbach SB (1933) Body length and organ weights of infants and children. Am J Pathol 9: 55–70
Couch R, Camfield PR, Tibbles JAR (1985) The changing picture of pseudotumour cerebri in children. Can J Neurol Sci 12: 48–50
Coulson JD, Pitlick PT, Miller DC, French JW, Marshall WH, Fryer AD, Shumway NE (1984) Severe superior vena cava syndrome and hydrocephalus after the Mustard procedure: findings and a new surgical approach. Circulation 70 [Suppl] 1: 47–53
Creasey H, Rapaport SI (1985) The aging human brain. Ann Neurol 17: 2–10
D'Avella D, Greenberg RP, Mingrino S, Scanarini M, Pardatscher K (1980) Alterations in ventricular size and intracranial pressure caused by sagittal sinus pathology in man. J Neurosurg 53: 656–661
Dahlerup B, Gjerris F, Harmsen A, Sorensen PS (1985) Severe headaches as the only symptom of long-standing dysfunction in hydrocephalic children with normal or slit ventricles revealed by computed tomography. Child Nerv Syst 1: 49–52
De Lange S, de Vlieger M (1970) Hydrocephalus associated with raised venous pressure. Dev Med Child Neurol [Suppl] 22: 28–32
De Mol J (1978) Troubles psychiques au cours d'hydrocephalie normotensive. Acta Neurol Belg 78: 321–340
Dillon T, Berman W Jr, Yabek SM, Seigel R, Ahl B, Wernly J (1986) Communicating hydrocephalus: A reversible complication of the Mustard operation with serial hemodynamics and long-term follow-up. Ann Thorac Surg 41: 146–149
Dobbing J, Undernutrition and the developing brain. Am J Dis Child 120: 411–415
Dobbing J, Sands J (1973) Quantitative growth and development of human brain. Arch Dis Child 48: 757–767
Dobbing J, Sands J (1970) Timing of neuroblast multiplication in developing human brain. Nature 226: 639–640
Dobbing J, Smart JL (1973) Early undernutrition, brain development and behaviour. In: Barnett SA (ed) Ethology and development. Heinemann Medical Books, Ltd, London, pp 16–36
Donaldson JO (1981) Pathogenesis of pseudotumor cerebri syndromes. Neurology 31: 877–880
Early CB, Fink LH (1976) Some fundamental applications of the law of Laplace in neurosurgery. Surg Neurol 6: 185–189
Ekbom K, Greitz T, Kalmer M, Lopez J, Ottosson S (1969) Cerebrospinal fluid pulsations in occult hydrocephalus due to ectasia of the basilar artery. Acta Neurochir (Wien) 20: 1–8
Ellison PH (1978) Re-evaluation of the approach to an enlarging head in infancy. Dev Med Child Neurol 20: 738–745
Engel M, Carmel PW, Chutorian AM (1979) Increased intraventricular pressure without ventriculomegaly in children with shunts with “normal volume hydrocephalus”. Neurosurgery 5: 549–552
Epstein F, Rubin RC, Hochwald GM (1974) Restoration of the cortical mantle in severe feline hydrocephalus: A new laboratory model. Dev Med Child Neurol [Suppl] 32: 49–53
Epstein FJ, Fleischer AS, Hochwald GM, Ransohoff J (1974) Subtemporal craniectomy for recurrent shunt obstruction secondary to small ventricles. J Neurosurg 41: 29–31
Faulhauer K, Schmitz P (1978) Overdrainage phenomena in shunt treated hydrocephalus. Acta Neurochir (Wien) 45: 89–101
Foltz EL (1984) Hydrocephalus and CSF pulsatility: clinical and laboratory studies. In: Shapiro K, Marmarou A, Portnoy H (eds) Hydrocephalus. Raven Press, New York, pp 337–362
Friedman P, Gass HH (1983) Lumboatrial shunt: case report. Neurosurgery 13: 69–71
Gaab MR, Czech T, Korn A (1984) “Pseudotumor cerebri”: Disturbance of “cerebrovenous outflow valve”? Neuropaediatrics 15: 241 (Abst)
Gjerris F, Sorensen PS, Vorstrup S, Paulson OB (1985) Intracranial pressure, conductance to cerebrospinal fluid outflow, and cerebral blood flow in patients with benign intracranial hypertension (pseudotumor cerebri). Ann Neurol 17: 158–162
Grant DN (1971) Benign intracranial hypertension: a review of 79 cases in infancy and childhood. Arch Dis Child 46: 651–655
Gruber R (1981) The relationship of ventricular shunt complications to the chronic overdrainage syndrome: A follow-up study. Z Kinderchir 34: 346–352
Gruber R (1983) Should “normalization” of the ventricles be the goal of hydrocephalus therapy? Z Kinderchir 38 [Suppl] 2: 80–83
Gucer G, Viernstein L (1978) Long-term intracranial pressure recording in the management of pseudotumor cerebri. J Neurosurg 49: 256–263
Gutierrez FA, Mclone DG, Raimondi AJ (1979) Physiopathology and a new treatment of chronic subdural hematoma in children. Child's Brain 5: 216–232
Hakim S, Adams RD (1965) The special clinical problem of symptomatic hydrocephalus with normal cerebrospinal fluid pressure. Observations on cerebrospinal fluid dynamics. J Neurol Sci 2: 307–327
Hakim S, Venegas JG, Burton JD (1976) The physics of the cranial cavity, hydrocephalus and normal pressure hydrocephalus: Medical interpretation and mathematical model. Surg Neurol 5: 187–210
Hammock MK, Milhorat TH, Baron IS (1976) Normal pressure hydrocephalus in patients with myelomeningocele. Dev Med Child Neurol [Suppl] 37: 55–68
Henningsen GJ, Jacobsen HH (1972) Abnormal pneumo-encephalogram in infancy subsequently normalized: three case histories from a child psychiatric department. Danish Med Bull 19: 110–113
Hill A, Shactelford D, Volpe JJ (1984) A potential mechanism of pathogenesis for early posthemorrhagic hydrocephalus in the premature newborn. Pediatrics 73: 19–21
Hill A, Volpe JJ (1981) Normal pressure hydrocephalus in the newborn. Pediatrics 68: 623–629
Hochwald GM, Epstein F, Malhan C, Ransohoff J (1972) The role of skull and dura in experimental feline hydrocephalus. Dev Med Child Neurol [Suppl] 27: 65–69
Hochwald GM, Ransohoff J (1973) The relationship of compensated to decompensated hydrocephalus in the cat. J Neurosurg 39: 694–697
Hogan PA, Woolsey RM (1966) Hydrocephalus in the adult. JAMA 198: 110–114
Holness RO, Hoffman HJ, Hendrick EB (1979) Subtemporal decompression for the slit-ventricle syndrome after shunting in hydrocephalic children. Child's Brain 5: 137–144
Hubschamann OR (1980) Twist drill craniostomy in the treatment of chronic and subacute subdural haematomas in severely ill and elderly patients. Neurosurg 6: 233–236
Hughes CP, Siegel BA, Coxe WS, Gado MH, Grubb RL, Coleman RE, Berg L (1978) Adult idiopathic communicating hydrocephalus with and without shunting. J Neurol Neurosurg Psychiatry 41: 961–971
Hyde-Rowan MD, Rekate HL, Nulsen FE (1982) Re-expansion of previously collapsed ventricles. The slit ventricle syndrome. J Neurosurg 56: 536–539
Johnston I, Paterson A (1974) Benign intracranial hypertension. I. Diagnosis and prognosis. Brain 97: 289–300
Johnston I (1975) The definition of a reduced CSF absorption syndrome: a reappraisal of benign intracranial hypertension and related syndromes. Med Hypoth 1: 10–15
Kaiser AM, Whitelaw AGL (1985) Cerebrospinal fluid pressure during post hemorrhagic ventricular dilatation in newborn infants. Arch Dis Child 60: 620–624
Kalff R, Bremer A, Kocks W, Roosen K, Lohr E (1985) Slit Ventrikel — Klinisches Syndrom oder radiologisches Phänomen? Radiologe 25: 437–439
Katzman R (1977) Normal pressure hydrocephalus. Contemp Neurol Ser 15: 69–92
Kendall B, Holland I (1981) Benign communicating hydrocephalus in children. Neuroradiology 21: 93–96
Kiekens R, Mortier W, Pothman R, Bock WJ, Seibert H (1982) The slit-ventricle syndrome after shunting in hydrocephalic children. Neuropediatrics 13: 190–194
Knutsson E, Lying-Tunnell U (1985) Gait apraxia in normal pressure hydrocephalus: patterns of movement and muscle activation. Neurology 35: 155–160
Korobkin R (1975) The relationship between head circumference and the development of communicating hydrocephalus in infants following intraventricular hemorrhage. Pediatrics 56: 74–77
Laws ER Jr, Mokri B (1977) Occult hydrocephalus: results of shunting correlated with diagnostic tests. Clin Neurosurg 24: 316–333
Lessell S, Rosman NP (1986) Permanent visual impairment in childhood pseudotumor cerebri. Arch Neurol 43: 801–805
Linder M, Diehl J, Sklar FH (1983) Subtemporal decompression for shunt-dependent ventricles: Mechanism of action. Surg Neurol 19: 520–523
Lobo Antunes J, Fahn S, Cote L (1983) Normal pressure hydrocephalus and Parkinson's disease. J Neural Trans [Suppl] 19: 225–231
Long DM (1985) Aging in the nervous system. Neurosurgery 17: 348–354
Lorber J, Priestley BL (1981) Children with large heads: a practical approach to diagnosis in 557 children with special reference to 109 children with megalencephaly. Dev Med Child Neurol 23: 494–504
Lorenzo AV, Page LK, Watters GV (1970) Relationship between cerebrospinal fluid formation, absorption and pressure in human hydrocephalus. Brain 93: 679–692
Ludwig B, Nix W, Lanksch W (1983) Computed tomography of the “armored brain”. Neuroradiology 25: 39–43
Lundberg N (1960) Continuous recording and control of ventricular fluid pressure in neurosurgical practice. Acta Psychiat Neurol Scand [Suppl] 149: 1–193
MacArthur CG, Doisy EA (1918) Quantitative chemical changes in the human brain during growth. J Comp Neurol 30: 445–486
Mann JD, Johnson RN, Butler AB, Bass NH (1983) Cerebrospinal fluid circulatory dynamics in pseudotumor cerebri and response to steroid therapy. In: Wood JH (ed) Neurobiology of cerebrospinal fluid 2. Plenum Press, New York, pp 739–751
Marcwalder TM, Seiler RW (1985) Chronic subdural hematomas. To drain or not to drain? Neurosurgery 16: 185–188
Marcwalder TM, Steinsieppe KF, Rohner M, Reichenbach W (1981) The course of chronic subdural hematomas after burrhole craniostomy and closed system drainage. J Neurosurg 55: 390–396
Markowitz RI, Kleinman CS, Hellenbrand WE, Kopf G, Ment LR (1984) Communicating hydrocephalus secondary to superior vena caval obstruction. Am J Dis Child 138: 638–641
Martins AN (1973) Resistance to drainage of cerebrospinal fluid: Clinical measurement and significance. J Neurol Neurosurg Psychiatry 36: 313–318
Mawk JR, McConnell J, Fulbright TD (1985) A suggested relationship between sagittal synostosis, intracranial hypertension and hydrocephalus. Minn Med 68: 562–563
McComb JG (1983) Recent research into the nature of cerebrospinal fluid formation and absorption. J Neurosurg 59: 369–383
McKissock W, Richardson A, Bloow W (1960) Subdural hematoma. A review of 389 cases. Lancet i: 1365–1369
McLauren R, Isaacs E, Lewis P (1971) Results of nonoperative treatment in 15 cases of infantile subdural hematoma. J Neurosurg 34: 753–759
Messert B, Baker NH (1966) Syndrome of progressive spastic ataxia and apraxia associated with occult hydrocephalus. Neurology 16: 440–452
Meyer JS, Kitagawa Y, Tanahashi N, Tachibana H, Kandula P, Cech DA, Clifton GL, Rose JE (1985) Evaluation of treatment of normal pressure hydrocephalus. J Neurosurg 62: 513–521
Meyer JS, Tachibana H, Hardenberg JP, Dowell RE Jr, Kitagawa Y, Mortel KF (1984) Normal pressure hydrocephalus. Influences on cerebral hemodynamic and cerebrospinal fluid pressure-chemical autoregulation. Surg Neurol 21: 195–203
Milhorat TH (1972) Hydrocephalus and the cerebrospinal fluid. William and Wilkins Co, Baltimore, pp 237–238
Oi S, Matsumoto S (1986) Morphological findings of post-shunt slit ventricles in experimental canine hydrocephalus-aspects of causative factors of isolated ventricles and slit ventricle syndrome. Childs Nerv System 2: 179–184
Ojemann RG, Fisher CM, Adams RD, Sweet WH, New PFJ (1969) Further experience with the syndrome of “normal” pressure hydrocephalus. J Neurosurg 31: 279–294
Ordy JM, Kaack B (1975) Neurochemical changes in composition, metabolism and neurotransmitters in the human brain with age. Adv Behav Biol 16: 253–285
Orr LS, Osher RH, Savino PJ (1978) The syndrome of facial nevi, anomalous cerebral venous return, and hydrocephalus. Ann Neurol 3: 316–318
Orrison WW, Robertson WC, Sackett JF (1978) Computerized tomography in chronic subdural hematomas (effusions) of infancy. Neuroradiology 16: 79–81
Paltesev EI, Sirovsky EB (1982) Intracranial physiology and biomechanics. Clinical data on pressure-volume relationships and their interpretation. J Neurosurg 57: 500–510
Penn RD, Bacus JW (1984) The brain as a sponge. A computed tomographic look at Hakim's hypothesis. Neurosurgery 14: 670–675
Peterson RC, Mokri B, Laws ER Jr (1985) Surgical treatment of idiopathic hydrocephalus in elderly patients. Neurology 35: 307–311
Portenoy RK, Berger A, Gross E (1984) Familial occurrence of idiopathic normal-pressure hydrocephalus. Arch Neurol 41: 335–337
Povlishock JT, Levine JE (1984) Cerebrospinal fluid absorption. In: Kapp JP, Schmidem HH (eds) Cerebral venous system and its disorders. Grune and Stratton Inc, pp 251–274
Reid AC, Matheson MS, Teasdale G (1980) Volume of the ventricles in benign intracranial hypertension. Lancet 2: 7–8
Robinson RG (1984) Chronic subdural hematoma: Surgical management in 133 patients. J Neurosurg 61: 263–268
Rose A, Matson DD (1967) Benign intracranial hypertension in children. Pediatrics 39: 227–237
Rosman NP, Shands KN (1978) Hydrocephalus caused by increased intracranial venous pressure: a clinicopathological study. Ann Neurol 3: 445–450
Ross RT (1983) Brain swelling and ventricle size. Can J Neurol Sci 10: 110–113
Rottenberg DA, Foley KM, Posner JB (1980) Hypothesis: the pathogenesis of pseudotumour cerebri. Med Hypoth 6: 913–918
Rubin RC, Hochward G, Tiell M, Liwnicz B, Epstein F (1975) Reconstitution of the cerebral cortical mantle in shunt-corrected hydrocephalus. Dev Med Child Neurol [Suppl] 35: 151–156
Rush JA (1980) Pseudotumour cerebri. Clinical profile and visual outcome in 63 patients. Mayo Clin Proc 55: 541–546
Saint-Rose C, LaCombe J, Pierre-Kehn A, Renier D, Hirsch JF (1984) Intra-cranial venous sinus hypertension: cause or consequence of hydrocephalus in infants? J Neurosurg 60: 727–736
Salmon JH (1978) The collapsed ventricle: management and prevention. Surg Neurol 9: 349–352
Samorajski T, Rolsten C (1973) Age and regional differences in the chemical composition of brains of mice, monkeys and humans. In: Fard DH (ed) Neurobiological aspects of maturation and aging. Elsevier Scientific Publ Co, Amsterdam. Prog Brain Res 40: 253–265
Schutz H, Fleming JFR, Humphreys RP, Deck JHN, Keith WS (1980) Normal pressure hydrocephalus — high pressure normocephalus. Can J Neurol Sci 7: 211–213
Serlo W, Heikkinen E, Saukkomen AL, Vomwendt L (1895) Classification and management of the slit ventricle syndrome. Child Nerv Syst 1: 194–199
Shapiro K, Fried A, Marmarou A (1985) Biomechanical and hydrodynamic characterization of the hydrocephalic infant. J Neurosurg 63: 69–75
Shapiro K, Takei F, Fried A, Kohn I (1985) Experimental feline hydrocephalus. The role of biomechanical changes in ventricular enlargement in cats. J Neurosurg 63: 82–87
Sepponen JT, Sepponen RE, Sivula A (1984) Chronic subdural haematoma: demonstration by magnetic resonance. Radiology 150: 79–85
Singounas EG, Krasanakis C, Karvounis PC (1976) Observations on the pathogenesis of low pressure hydrocephalus. Analysis of 25 cases. Neurochirurgia 19: 22–25
Sklar FH, Beyer CW, Clark WK (1980) Physiological features of the pressure-volume function of brain elasticity in man. J Neurosurg 53: 166–172
Sklar FH, Diehl JT, Beyer CW, Clark WK (1980) Brain elasticity changes with ventriculomegaly. J Neurosurg 53: 173–179
Skullerud K (1985) Variations in the size of the human brain. Influence of age, sex, body length, body mass index, alcoholism, Alzheimer changes, and cerebral atherosclerosis. Acta Neurol Scand [Suppl] 102: 1–94
Smith TJ, Baker RS (1986) Perimetric findings in pseudotumor cerebri: using automated techniques. Ophthalmology 93: 887–892
Sorensen PS, Gjerris F, Hammer M (1984) Cerebrospinal fluid vasopressin and increased intracranial pressure. Ann Neurol 15: 435–440
Spector RH (1984) Pseudotumour cerebri caused by a synthetic vitamin A preparation. Neurology 34: 1509–1511
Spence JD, Amacher AL, Willis NR (1980) Benign intracranial hypertension without papilloedema: role of 24-hour cerebrospinal fluid pressure monitoring in diagnosis and management. Neurosurgery 7: 326–336
Stein BM, Fraser RER, Tenner MS (1972) Normal pressure hydrocephalus: complication of posterior fossa surgery in children. Pediatrics 49: 50–58
Tilney F, Rosett J (1931) The value of brain lipoids as an index of brain development. Bull Neurol Inst NY 1: 28–71
Walsh JW, James HE (1982) Subtemporal craniectomy and elevation of shunt valve opening pressure in the management of small ventricle-induced cerebrospinal fluid shunt dysfunction. Neurosurgery 10: 698–703
Warwick R, Williams PL (eds) (1973) Gray's Anatomy 35th Ed. Longman, Edinburgh, 311 pp
Welsh JE, Tyson GW, Winn HR, Jane JA (1979) Chronic subdural haematoma presenting as transient neurologic deficits. Stroke 10: 564–567
Weisberg LA, Chutorian AM (1977) Pseudotumor cerebri of childhood. Am J Dis Child 131: 1243–1248
Weisberg LA (1975) Benign intracranial hypertension. Medicine 54: 197–207
Weisberg LA (1985) Computed tomography in benign intracranial hypertension. Neurology 35: 1075–1078
Wiggins RC (1986) Myelination — a critical stage in development. Neurotoxicology 7: 103–120
Wikkelso C, Andersson H, Blomstrand C, Lindqvist G (1982) The clinical effect of lumbar puncture in normal pressure hydrocephalus. J Neurol Neurosurg Psychiatry 45: 64–69
Winick M, Rosso P, Waterlow J (1970) Cellular growth of cerebrum, cerebellum, and brain stem in normal and marasmic children. Exp Neurol 26: 393–400
Wree A, Braak H, Schleicher A, Zilles K (1980) Biomathematical analysis of the neuronal loss in the aging human brain of both sexes demonstrated in pigment preparations of the pars cerebellaris loci coerulei. Anat Embryol 160: 105–119
Yakovlev PI, Lecours AR (1967) The myelogenetic cycles of regional maturation of the brain. In: Minhowski A (ed) Regional development of the brain in early life. Blackwell Scientific Publ, Oxford, pp 3–80
Yelin FS, Ehni G (1969) Percallosal sump ventriculostomy for shunt-dependent hydrocephalic patient with small ventricles. J Neurosurg 31: 570–573
Zeumer H, Hacke W, Hartwich P (1982) A quantitative approach to measuring the cerebrospinal fluid space with CT. Neuroradiology 22: 193–197
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Cardoso, E.R., Del Bigio, M.R. & Schroeder, G. Age-dependent changes of cerebral ventricular size. Acta neurochir 97, 40–46 (1989). https://doi.org/10.1007/BF01577738
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DOI: https://doi.org/10.1007/BF01577738