The relationship of Arnold-Chiari and Dandy-Walker malformations

1972 ◽  
Vol 36 (4) ◽  
pp. 481-486 ◽  
Author(s):  
W. James Gardner ◽  
J. Lawton Smith ◽  
Dorcas H. Padget
Keyword(s):  
Posterior Fossa ◽  
Chiari Malformation ◽  
Content Type ◽  
Arnold Chiari Malformation ◽  
Dandy Walker Malformation ◽  
Walker Malformation ◽  
Relationship Of ◽  
The Relationship ◽  
Fine Print

✓ The posterior fossa is abnormally small in cases of Arnold-Chiari malformation because the tentorium is too low, whereas it is abnormally large in the Dandy-Walker malformation because the tentorium is too high.

A simple, inexpensive technique for accurate mass localization by computerized tomography

1980 ◽  
Vol 52 (5) ◽  
pp. 733-735 ◽  
Author(s):  
John I. Moseley ◽  
Steven L. Giannotta ◽  
Justin W. Renaudin
Keyword(s):  
Computerized Tomography ◽  
Accurate Mass ◽  
Content Type ◽  
Accurate Localization ◽  
Relationship Of ◽  
The Relationship ◽  
Inexpensive Technique ◽  
Tomography Scanning ◽  
Fine Print

✓ A simple wire template is placed on the patient's head during computerized tomography scanning, and the results of the scan are later reproduced on the scalp prior to surgery. Measurements of the distance between the wires and the relationship of the mass provide the key to accurate localization of the mass on the scalp surface.

Relationship of perfusion pressure and size to risk of hemorrhage from arteriovenous malformations

1992 ◽  
Vol 76 (6) ◽  
pp. 918-923 ◽  
Author(s):  
Robert F. Spetzler ◽  
Ronald W. Hargraves ◽  
Patrick W. McCormick ◽  
Joseph M. Zabramski ◽  
Richard A. Flom ◽  
...  
Keyword(s):  
Perfusion Pressure ◽  
Feeding Artery ◽  
Content Type ◽  
Arterial Blood ◽  
The Mean ◽  
Feeding Pressure ◽  
Risk Of Hemorrhage ◽  
Relationship Of ◽  
The Relationship ◽  
Fine Print

✓ The relationship between the size of an arteriovenous malformation (AVM) and its propensity to hemorrhage is unclear. Although nidus volume increases geometrically with respect to AVM diameter, hemorrhages are at least as common, in small AVM's compared to large AVM's. The authors prospectively evaluated 92 AVM's for nidus size, hematoma size, and arterial feeding pressure to determine if these variables influence the tendency to hemorrhage. Small AVM's (diameter ≤ 3 cm) presented with hemorrhage significantly more often (p < 0.001) than large AVM's (diameter > 6 cm), the incidence being 82% versus 21%. Intraoperative arterial pressures were recorded from the main feeding vessel(s) in 24 of the 92 patients in this series: 10 presented with hemorrhage and 14 presented with other neurological symptoms. In the AVM's that had hemorrhaged, the mean difference between mean arterial blood pressure and the feeding artery pressure was 6.5 mm Hg (range 2 to 15 mm Hg). In the AVM's that did not rupture, this difference was 40 mm Hg (range 17 to 63 mm Hg). Smaller AVM's had significantly higher feeding artery pressures (p < 0.05) than did larger AVM's, and they were associated with large hemorrhages. It is suggested that differences in arterial feeding pressure may be responsible for the observed relationship between the size of AVM's and the frequency and severity of hemorrhage.

Laboratory experience with a magnetically guided intravascular catheter system

1973 ◽  
Vol 38 (2) ◽  
pp. 145-154 ◽  
Author(s):  
Herbert L. Cares ◽  
J. Richard Hale ◽  
D. Bruce Montgomery ◽  
Howard A. Richter ◽  
William H. Sweet
Keyword(s):  
Intravascular Catheter ◽  
Selective Angiography ◽  
Content Type ◽  
Laboratory Experience ◽  
Arteriovenous Fistulas ◽  
Catheter System ◽  
Relationship Of ◽  
The Relationship ◽  
Fine Print

✓ An improved magnetically-guided intravascular catheter system in dogs is described as safe, requiring little attention, allowing the application of flow surges to aid propulsion of the tip, and providing for angiography of good quality. Current concepts of the relationship of magnetic and flow guidance are discussed. The uses of the system demonstrated include selective angiography, perfusion of isobutyl-2-cyanoacrylate into experimental arteriovenous fistulas, and perfusion of microparticulate iron suspensions into experimental aneurysms. A unique detachable macroballoon that may function as a reversible tethered embolus is reported.

Mesencephalic spur (beaking deformity of the tectum) in Arnold-Chiari malformation

1976 ◽  
Vol 45 (3) ◽  
pp. 315-320 ◽  
Author(s):  
Adelola Adeloye
Keyword(s):  
Chiari Malformation ◽  
Type Ii ◽  
Content Type ◽  
Arnold Chiari Malformation ◽  
Degrees Of Severity ◽  
Fine Print

✓ The beaking deformity of the tectum, referred to in this paper as the mesencephalic spur, is regularly present in the Type II variety of the Arnold-Chiari malformation in varying degrees of severity. When the mesencephalic spur is related to associated myelomeningocele, it was found that the more extensive the myelomeningocele, and the older the affected children, the more prominent was the mesencephalic spur.

Immunobiology of primary intracranial tumors

1977 ◽  
Vol 47 (6) ◽  
pp. 871-885 ◽  
Author(s):  
Ronald E. Woosley ◽  
M. Stephen Mahaley ◽  
Jane L. Mahaley ◽  
Gary M. Miller ◽  
William H. Brooks
Keyword(s):  
Effector Cell ◽  
Intracranial Tumors ◽  
Content Type ◽  
Postoperative Course ◽  
Immune Parameters ◽  
Relationship Of ◽  
The Relationship ◽  
Cytotoxic Responses ◽  
Fine Print

✓ Fifty-six in vitro microcytotoxicity assays were conducted on 30 patients with intracranial tumors at various times during their postoperative course. Significant specific cellular cytotoxic responses were found in nine of 56 assays, humoral cytotoxic responses in nine of 54 assays, and host effector cell-dependent, antibody-dependent cytotoxic responses in four of 28 assays. Variables that might influence the occurrence of cytotoxicity were studied, and the relationship of these findings to other immune parameters was discussed.

No ordinary time, no ordinary men: the relationship between Harvey Cushing and Franklin D. Roosevelt, 1928–1939

2001 ◽  
Vol 95 (2) ◽  
pp. 354-368 ◽  
Author(s):  
Richard L. Rovit ◽  
William T. Couldwell
Keyword(s):  
Personal Relationship ◽  
Content Type ◽  
Harvey Cushing ◽  
Medical Issues ◽  
Ordinary Time ◽  
The Times ◽  
Franklin Delano Roosevelt ◽  
Relationship Of ◽  
The Relationship ◽  
Fine Print

✓ The authors elucidate the strong personal relationship that developed between Dr. Harvey Cushing and Franklin Delano Roosevelt (FDR) from 1928 to 1939, as manifested in their frequent letters to each other. The relationship was initiated by the marriage of their children. Through his correspondence with FDR, Cushing was able to affect several medical issues of the period. The relationship of these two individuals is set within the historical, social, and political contexts of the times.

Endoscopy of the posterior fossa and dissection of acoustic neuroma

1999 ◽  
Vol 91 (5) ◽  
pp. 776-780 ◽  
Author(s):  
Nebil Göksu ◽  
Yıldırım Bayazıt ◽  
Yusuf Kemaloğlu
Keyword(s):  
Posterior Fossa ◽  
Acoustic Neuroma ◽  
Residual Tumor ◽  
Lateral Aspect ◽  
Content Type ◽  
Retrolabyrinthine Approach ◽  
The Relationship ◽  
Neurovascular Structures ◽  
Internal Acoustic Canal ◽  
Fine Print

Object. The authors evaluated the importance of endoscopes in eliminating the disadvantages of the posterior fossa approach, such as the lack of adequate visualization of the lateral aspect of the internal acoustic canal (IAC).Methods. Between 1989 and 1998, 32 patients underwent removal of acoustic neuroma (AN) via a combined retrosigmoid—retrolabyrinthine approach. Endoscopes were used at different stages of the operation, and their use was evaluated with regard to elimination of the disadvantages of the posterior fossa approach. All patients in whom AN had been diagnosed underwent surgery in which a standard retrosigmoid—retrolabyrinthine approach was used. Standard sinus endoscopes of 0°, 30°, and 70° were introduced into the cerebellopontine angle before debulking the tumor, and the IAC was inspected at the end of the operation. Neurovascular integrity as well as the relationship between the AN and surrounding structures were evaluated. The IAC was inspected for residual tumor, and if any was found, endoscopically guided tumor dissection was performed.Conclusions. Endoscopes have facilitated an understanding of the anatomy between an AN and neighboring neurovascular structures. For surgery in which the posterior fossa approach is used, endoscopes can make operations safer by eliminating the disadvantages of the approach. In addition to allowing inspection of the fundus, it is possible to perform endoscopically guided tumor dissection within the IAC.

Relation of preoperative angiographic characteristics of the posterior communicating artery to the results of common carotid ligation

1972 ◽  
Vol 36 (5) ◽  
pp. 564-568 ◽  
Author(s):  
Kenneth Tuerk ◽  
Norman E. Chase ◽  
Irvin I. Kricheff ◽  
Joseph P. Lin ◽  
Joseph Ransohoff
Keyword(s):  
Contrast Material ◽  
Posterior Communicating Artery ◽  
Carotid Angiography ◽  
Content Type ◽  
Carotid Ligation ◽  
Before And After ◽  
Relationship Of ◽  
The Relationship ◽  
Fine Print

✓ Twenty patients with posterior communicating artery aneurysms were treated with common carotid ligation. Postligation visualization was accomplished in 16 cases by ipsilateral brachial angiography. Two other aneurysms were visualized by contralateral brachial and contralaterial carotid angiography. The size of the aneurysm was measured before and after ligation. The relationship of postoperative reduction in size to preoperative angiographic characteristics was studied. Reduction in the size of the aneurysm occurred most often when preoperative angiography showed that the sac was long and its neck narrow, and when there was stasis of contrast material in the aneurysm.

Thrombosis: the relationship of hemostatic mechanisms to drug therapy

1981 ◽  
Vol 54 (1) ◽  
pp. 1-11 ◽  
Author(s):  
Stanford Wessler ◽  
Sanford N. Gitel
Keyword(s):  
Drug Therapy ◽  
Content Type ◽  
Relationship Of ◽  
The Relationship ◽  
Fine Print

✓ The mechanisms of arteriovenous and microcirculatory thrombosis and embolism are presented. Drugs affecting the hemostatic balance and their specific actions and indications are reviewed.

Meningomyelocele and progressive hydromyelia

1975 ◽  
Vol 43 (4) ◽  
pp. 457-463 ◽  
Author(s):  
Peter V. Hall ◽  
Robert L. Campbell ◽  
John E. Kalsbeck
Keyword(s):  
Clinical Improvement ◽  
Sensory Loss ◽  
Ventricular Drainage ◽  
Prominent Feature ◽  
Content Type ◽  
Relationship Of ◽  
The Relationship ◽  
Progressive Paraparesis ◽  
Fine Print

✓ Five cases of myelodysplasia with progressive paraparesis are presented. Three of the five patients developed spasticity, but dissociated sensory loss and loss of sphincter control was not a prominent feature. All were found to have compensated hydrocephalus and extensive communicating hydromyelia. The use of myelography and ventriculography in the diagnosis of hydromyelia is discussed. Ventricular drainage led to clinical improvement in two cases and radiological improvement in one. The relationship of compensated hydrocephalus, meningomyelocele, and progressive hydromyelia postnatally may support the hydrodynamic hypothesis of myelodysplasia.

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