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Omar M. Arnaout, Bradley A. Gross, Christopher S. Eddleman, Bernard R. Bendok, Christopher C. Getch, and H. Hunt Batjer

A lthough infratentorial AVMs comprise only 7–15% of intracranial AVMs, 1 , 2 , 8 , 10 , 26 , 38 accumulating data have demonstrated an independent association of infratentorial AVM location and hemorrhagic presentation. 19 , 26 , 38 This is alarming in light of the considerably greater morbidity and mortality associated with posterior fossa AVM rupture. 12 , 18 Fortunately, with accumulating surgical experience and the cultivation of multimodality AVM therapy, therapeutic success continues to improve. 18 , 21 , 25 This is particularly crucial in light

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Ayten Someren, Carrol P. Osgood Jr., and James Brylski

BUN. Hematocrit was 38%, fasting blood sugar 112 mg%, circulatory leukocytes 6465/mm 3 with 76% polymorphonuclear cells, 16% lymphocytes, 7% monocytes, and 1% basophils. Pneumoencephalogram on February 28, 1969, demonstrated prominent compression and ventral displacement of the fourth ventricle on the lateral projection. The anterior projection showed a gentle bowing of the fourth ventricle to the right. Angiography of the posterior fossa revealed superior-ventral displacement of the choroidal loop of the left posterior-inferior cerebral artery on the lateral

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Hideharu Karasawa, Hajime Furuya, Hiromichi Naito, Ken Sugiyama, Junji Ueno, and Hiroshi Kin

T raumatically induced mass lesions of the posterior cranial fossa are unusual. 1, 9 There have been very few reports of acute hydrocephalus caused by injury to the posterior fossa. 4, 5, 10 In fact, we believe the present study is the first one reported to use computerized tomography (CT) scanning to examine acute hydrocephalus in posterior fossa injury. Clinical Material and Methods Patient Population From October 1983 to September 1995, 1802 patients with acute head trauma were hospitalized at the Funabashi Municipal Medical Center. The present

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Michael E. Kelly, Raphael Guzman, John Sinclair, Teresa E. Bell-Stephens, Regina Bower, Scott Hamilton, Michael P. Marks, Huy M. Do, Steven D. Chang, John R. Adler, Richard P. Levy, and Gary K. Steinberg

A rteriovenous malformations of the posterior fossa are relatively uncommon, and represent between 5 and 18% of all cerebral AVMs. 1–3 , 6 Posterior fossa AVMs can be classified according to location to facilitate treatment planning. Lesions can involve the cerebellum (vermis and/or hemisphere), the brainstem (midbrain, pons, and medulla), or a combination of the 2 locations. 2 , 4 Arteriovenous malformations that involve the cerebellum comprise ~ 60–75% of all posterior fossa AVMs. 2 , 4 , 22 The presentation of posterior fossa AVMs differs from their

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L. Philip Carter and Hal W. Pittman

H emorrhage in the posterior fossa of newborn infants is not an unusual finding at autopsy. Such hemorrhages are usually massive and due to rupture of the vein of Galen or tentorial tears into the lateral or straight sinus, probably secondary to head molding. 3, 7 A rare but more important lesion is the smaller treatable posterior fossa subdural hematoma of the newborn. Matson 2 focused attention on this entity and referred to unpublished cases of his own, although he stated it is quite rare. We have found nine cases described in the literature. 1, 4–6, 8

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Samuel F. Ciricillo, Richard L. Davis, and Charles B. Wilson

of neuroepithelium into or out of the primitive ventricular system. 17–20 Neuroepithelial cysts can occur anywhere along the neuraxis. 17 Most cysts arise from choroid plexus or ependyma along the anterior portion of the third ventricle adjacent to the foramen of Monro, although lesions involving the sella, fourth ventricle, pineal region, sylvian fissure, cervical spine, and conus medullaris have been reported. 6, 7, 9, 11–13, 17–21 True posterior fossa neuroepithelial cysts appear to be quite rare; to our knowledge, only five reports of this entity have been

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Robert H. Rosenwasser, Laurence I. Kleiner, Joseph P. Krzeminski, and William A. Buchheit

D ue to the constraint in size and the critical structures within the posterior fossa, continuous knowledge of the postoperative pressures has been deemed desirable in patients with surgery in this region, particularly in those subjected to prolonged procedures. In patients whose neurological examination results may be inconclusive or limited, it is valuable to have a reliable alternative method of evaluation. In the past, surgeons have been reluctant to introduce direct subdural posterior fossa monitors for a number of reasons. Some of the possible problems

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Stewart B. Dunkser and Howell S. McCreary

the dura over the center of the skull defect has invariably been found absent, and a cyst covered by arachnoid and filled with cerebrospinal fluid protruded through the bone defect. Arachnoid cysts have been described as occurring in the posterior fossa, but leptomeningeal cysts in the posterior fossa are rare. Case Report An 18-year-old male student was admitted to Barnes Hospital on April 19, 1968, with complaints of occipital headaches and of a head tremor, both of which had been gradually increasing in severity for 5 years. His birth and development had

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Shih-Tseng Lee, Tai-Ngar Lui, Chen-Nen Chang, and Wen-Chun Cheng

T he occurrence of seizures immediately or during the 2 weeks after supratentorial surgery has been well recognized both in the literature and in daily neurosurgical practice. The development of seizures in patients after posterior fossa surgery is a rather uncommon phenomenon. 2, 3, 7, 9, 16 Most studies of early postoperative seizures have included all intracranial operations or only patients with supratentorial surgery. 1–3, 5, 7–9, 13, 14, 16–20 In our department, no prophylactic anticonvulsant agent is given to patients either before or after posterior

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Carlo Bellotti, Massimo Medina, Giuseppe Oliveri, Salvatore Barrale, and Francesco Ettorre

radiological diagnosis and definition of this nosological entity. 1, 5, 6, 8, 11, 12 Cavernous angiomas may be cystic 9, 13 and have been reported to occur in the posterior fossa. 8, 15, 16 We describe three such patients who were managed at our institution during the years 1983 and 1984. All three underwent total removal of the cyst, with good results. Case Reports Case 1 This 54-year-old man with a history of schizophrenia had for 2 months been suffering from intracranial hypertension of increasing severity. A week before admission the patient, who was totally