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Neurosurgical Forum: Letters to the Editor To the Editor Takamitsu Fujimaki , M.D., Ph.D. Kiyoshi Takagi , M.D., Ph.D. Teikyo University Kazuya Nagata , M.D., Ph.D. NTT East Kanto Hospital Tokyo, Japan 1144 1146 Abstract Object. The purpose of this study was to establish a standard curve to demonstrate normal age-related changes in the proportion of intracranial cerebrospinal fluid (CSF) in intracranial volume (ICV) during each decade of life. Methods. Using volumetric

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Richard E. Clatterbuck, John L. Moriarity, Ilhan Elmaci, Roland R. Lee, Steven N. Breiter and Daniele Rigamonti

. Over the course of 352.9 patient years, 114 lesions were identified and analyzed by location, volume, and MR imaging signal characteristics. In 71 lesions at least one follow-up image was available for similar analysis. On the basis of these serial data, we have calculated the rate of volume change in CMs and have described the progression of typical signal characteristics in these lesions over time. The natural history of our patient population has been reported elsewhere. 13 Clinical Material and Methods Patient Population The patient population consisted of 68

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Spiros Sgouros, J. Henry Goldin, Anthony D. Hockley, Michael J. C. Wake and Kalyan Natarajan

W hile attempting to investigate changes in intracranial volume in children with craniosynostosis, it became apparent that there was no normal reference range of changes in intracranial volume throughout childhood that could be used for a comparative study. Few studies have been published in which the development of intracranial volume in childhood has been investigated in healthy individuals. 3, 14, 18, 21, 25, 28 In all of these, volume was calculated from two-dimensional (2D) parameters derived from landmarks observed on plain skull radiographs. Following

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Theodore H. Schwartz, Brian Ho, Charles J. Prestigiacomo, Jeffrey N. Bruce, Neil A. Feldstein and Robert R. Goodman

, 29 This technique has demonstrated that ICP may remain elevated immediately after third ventriculostomy and begins to decrease between 4 to 8 days postoperatively. In an earlier retrospective study, 30 we showed that careful measuring of ventricular diameter on standard CT scans will show a consistent decrease in both third and lateral ventricular size if performed later than 1 month after successful surgery (that is, in patients with clinical improvement). We hypothesized that, because volume changes in proportion to the cube of the radius, measurements of

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Chris Xenos, Spyros Sgouros and Kalyan Natarajan

M any different methods have been reported for measuring the volume of the ventricular system in humans. Traditional volumetric methods required the production of casts of the ventricular system. 3, 18 The use of autopsy material led to artifacts directly attributable to the postmortem brain swelling or shrinkage due to fixation, and had the potential to compromise volume accuracy and reliability. 1, 8, 15, 25, 32 Before the advent of modern neuroimaging, pneumoencephalography was used for various described linear measurements. The classic Evans ratio 9

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Spiros Sgouros, Anthony D. Hockley, J. Henry Goldin, Michael J. C. Wake and Kalyan Natarajan

until the patient reaches 12 months of age. 21, 46 This wide variation implies that there is no clearly defined view of the relationship between the brain and skull vault growth in patients with craniosynostosis. The dynamics of intracranial volume change in patients with craniosynostosis have not been addressed systematically thus far. A significant problem implicated previously has been the lack of an accurate, reproducible, and simple way of measuring the capacity of the intracranial cavity. For the same reason, no adequate reference information exists on normal

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The pressure-volume function of brain elasticity

Physiological considerations and clinical applications

Frederick H. Sklar and Ilya Elashvili

T he significance of the intracranial pressure-volume relationship has been a topic of extensive clinical and laboratory investigation. The elasticity of brain, meninges, and blood vessels determines the immediate pressure response to a rapid alteration of intracranial volume. 4, 14, 26, 27 It has been suggested that quantitative consideration of the pressure-volume relationship has important clinical and therapeutic applications. 21, 24, 28 This paper reviews the relationship of intracranial pressure as a function of volume. The pressure-volume function is

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Robert P. Bentley, Spyros Sgouros, Kalyan Natarajan, M. Stephen Dover and Anthony D. Hockley

T he diagnosis and surgical correction of craniofacial anomalies often lead to orbital surgery, which initiates subsequent changes in orbital volume that would benefit from accurate, quantitative, and standardized points of reference. While investigating changes in orbital volume in children with craniosynostosis, 1 it became apparent to us that there was no accurate, reliable normal reference range of changes in orbital volume throughout childhood that could be used for a comparative study. Although CT scanning has taken a leading role as a diagnostic

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Computerized tomography brain scan tumor volume determinations

Sensitivity as an objective criterion of response to therapy

M. Stephen Mahaley Jr., G. Yancey Gillespie and Rita Hammett

measurements with occasional attempts to reconstruct mathematically the volume of the tumor based upon individual image areas and scan slice thickness. Finally, using a personal computer and digitizing tablet, a hand-held cursor has been used to trace a transilluminated CT image of the perimeter of an enhancing tumor. Microcomputer software converts the digitized tracings into a calculated area for each scan slice with subsequent conversion of all slices into an estimated tumor volume. Regrettably, many clinical investigative reports give little precise detail as to exactly

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Angelo L. Maset, Anthony Marmarou, John D. Ward, Sung Choi, Harry A. Lutz, Danny Brooks, Richard J. Moulton, Antonio DeSalles, J. Paul Muizelaar, Hope Turner and Harold F. Young

S ince the introduction of intracranial pressure (ICP) measurement by Guillaume and Janny 4 and Lundberg, 13 ICP monitoring has been a useful adjunct in the management of patients with brain injury. Clinical studies reported during the last decade have described the close correlation between intracranial hypertension and outcome. 2, 7, 9, 16, 17, 20–22 Other reports have emphasized the neurological deterioration resulting from secondary insult to the brain induced by depletion of volume-buffering capacity and development of high ICP. As a result of these