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Topic: Infratentorial

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	Korean Journal of Radiology (Site not responding. Last check: 2007-10-14)
		Intratumoral hemorrhage occurred in 57% (4/7) of supratentorial, 32% (6/19) of infratentorial, and 9% (3/35) of spinal cord tumors.
		Peritumoral edema occurred in 57% (4/7) of supratentorial, 16% (3/19) of infratentorial and 23% (8/35) of spinal cord tumors.
		Infratentorial tumors ranged in size from 3.0 to 7.0 (mean, 4.9) cm, and the extent of spinal cord tumors, measured along their neuraxis, was 1-13 (mean, 3.1) vertebral segments.
	www.kjronline.org /abstract/view_articletext.asp?year=2002&page=219 (3668 words)

	Brisman et al. 12-96
		Supratentorial procedures that produced infratentorial hemorrhages involved operations in the deep sylvian fissure and paraclinoid region in 81% of the patients and hemorrhages in the cerebellar vermis in 67% of the patients.
		Infratentorial procedures that produced supratentorial hemorrhages were performed with the patient in the sitting position for 87% of the patients.
		Infratentorial hemorrhages involved the cerebellum in 16 cases and the pons in 1 case.
	www.c3.hu /~mavideg/ns/Brisman12-96.html (4631 words)

	Neurological Research: Infratentorial intracranial pressure monitoring in neurosurgical intensive care unit (Site not responding. Last check: 2007-10-14)
		The pressure gradients between the infratentorial and supratentorial regions may be significant2'3 in patients with posterior fossa mass lesions.
		Infratentorial ICP sensors were inserted during craniotomy or craniectomy to address each patient's primary pathology.
		Infratentorial ICP monitoring continued for 2 to 3 days depending on clinical circumstances; after that the sensor was removed at the patient's bedside.
	newssearch.looksmart.com /p/articles/mi_qa3909/is_200312/ai_n9303095 (1251 words)

	AANS.org \| Education and Meetings \| AANS Scientific Journals \| Neurosurgical Focus
		Simultaneous supratentorial and infratentorial intracranial pressure recordings performed in seven of the patients showed a pressure gradient between the supratentorial and infratentorial compartments with a higher supratentorial pressure before shunt revision.
		In seven cases, supratentorial and infratentorial ICPs were recorded simultaneously before and after shunt revision by using a coronal supratentorial extradural sensor and an occipital infratentorial extradural sensor.
		Supratentorial and infratentorial pressures were recorded in one (Case 19) of the eight patients who were treated successfully by third ventriculostomy.
	www.aans.org /education/journal/neurosurgical/dec98/5-6-p2.asp (4784 words)

	Neurological Research: Infratentorial intracranial pressure monitoring in neurosurgical intensive care unit (Site not responding. Last check: 2007-10-14)
		The mean infratentorial ICP was 20-22 mmHg and supratentorial ICP was 6-8 mmHg immediately after the hematoma evacuation (Figure 2).
		Infratentorial ICP sensor was removed after 2 days of monitoring, and EVD was removed 3 days later.
		Mean infratentorial ICP was 23 mmHg and supratentorial ICP was 10 mmHg during the first 24 h after the surgery (Figure 3).
	www.findarticles.com /p/articles/mi_qa3909/is_200312/ai_n9303095 (1251 words)

	Brain Tumors: Ependymoma (Site not responding. Last check: 2007-10-14)
		These tumors are classified as either supratentorial (in the top part of the head) or infratentorial (in the back of the head).
		In children, the majority of ependymomas occur as infratentorial tumors arising in or around the fluid-filled fourth ventricle.
		Patients with infratentorial tumors also have unsteady gait, problems with coordination, and neck pain or stiffness resulting from irritation of the upper cervical nerves by the tumor.
	www.littledov.com /AngelsOfAffliction/Cancer/ependymoma.htm (383 words)

	AANS.org \| Education and Meetings \| AANS Scientific Journals \| Neurosurgical Focus
		Surgical access to these deep and confined lesions is hampered by the direct proximity of highly vulnerable neural structures such as the brainstem and cranial nerves, as well as by the structure of the petrous bone, which blocks direct surgical approach to these aneurysms.
		A number of surgical tactics consisting of different supra- and infratentorial approaches have been applied over the years to gain access to these treacherous lesions.
		Supra- and infratentorial burr holes are connected by a craniotome.
	aans.org /education/journal/neurosurgical/july96/jnsp1.asp?... (3969 words)

	SURGICAL APPROACHES TO TENTORIAL MENINGIOMAS (Site not responding. Last check: 2007-10-14)
		Small and medium tumors extending supra- or infratentorially are approached by a combination of a trans-sylvian and anterior subtemporal approach.
		This is a versatile approach that is applicable to a wide variety of lesions in the area of the tentorial incisura, petrous ridge, and clivus.
		The approach relies on converting the supra- and infratentorial compartments into one by dividing the tentorium and thus allowing a wider access to the tentorial incisura.
	www.meningiomas.info /surgicalapproachtotentorialmenin.htm (2436 words)

	ICP monitors
		Approximately 1/2 of supratentorial tumors arise from the wall of the ventricle, the remainder arise remote from the ventricle presumably from fetal rests of ependymal cells.
		Almost all infratentorial ependymomas occur in the midline often involving the floor of the IVth ventricle and tend to be solid.
		Ataxia, nystagmus, nausea, vomiting, and raised ICP are commonly present with infratentorial lesions.
	www.ucsf.edu /nreview/06.2-Oncology-Glial/Ependymomas.html (1207 words)

	[No title] (Site not responding. Last check: 2007-10-14)
		One of the 4 Barkhof criteria is the presence of an infratentorial lesion.
		The combinations that retained the infratentorial lesion parameter had lower specificities in the CISB group; in analysis of the group with other CIS, no such differences were found.
		The infratentorial lesion criterion is responsible for the lower specificity of Barkhof criteria in CISB.
	www.mult-sclerosis.org /news/Feb2004/MedlineBarkhofCriteriaPredictingConversiontoMSwrtBrainstemSyndromes.html (291 words)

	pediatric
		Pilocytic astrocytomas account for 30% of all infratentorial tumors in childhood, and 80% of pilocytic astrocytomas are found in the posterior fossa.
		Brainstem tumors are most commonly diagnosed in children, in whom they account for 10% to 20% of the primary brain tumors.
		Papilledema on fundoscopy is seen in 40% of supratentorial tumors and 65% of infratentorial tumors.
	www.thamburaj.com /pediatric.htm (2545 words)

	Cancer - Brain Tumor Registry Reporting Presentation Slide 52 - NPCR (Site not responding. Last check: 2007-10-14)
		Approximately 50% of brain tumors in children are infratentorial, and three-quarters of these are located in the cerebellum or fourth ventricle.
		Infratentorial means that the tumor originates BELOW the tentorium, the meninges separating the cerebrum from the cerebellum and brain stem.
		Common infratentorial (posterior fossa) tumors include: cerebellar astrocytomas (usually pilocytic but also fibrillary and high-grade), medulloblastomas (primitive neuroectodermal tumors), ependymomas (low-grade or anaplastic), brain stem gliomas (high-grade or low-grade), and atypical teratoid tumors.
	www.cdc.gov /cancer/NPCR/training/ppt/slides/052.htm (133 words)

	Brain Tumor information - Institute for Neurology and Neurosurgery, New York City
		Less frequently, astrocytomas occur in an infratentorial (base of the brain in the back near the neck) location.
		An ependymoma is another type of a glioma which arises from ependymal cells which are most commonly located in the central canal of the spinal cord and in the ventricles of the brain.
		A part of the latter region is referred to as the posterior fossa and includes the brainstem, fourth ventricle and the cerebellum.
	nyneurosurgery.org /child_brain_tum_type.html (2078 words)

	Kim B et al., Current management of intracranial ependymomas in children. 2 (3), July 2002 (Site not responding. Last check: 2007-10-14)
		The most characteristic finding to support a diagnosis for infratentorial ependymomas is downward extension of the tumor through the foramen of Magendie into the cervical subarachnoid space or through the foramen of Luschka into the cerebellopontine cistern(2, 8, 9, 22).
		Review of the recent literature reveals that the rate of total resection for supratentorial ependymomas appears to be 53-72% and for infratentorial ependymoma 27-55%(4, 23-26, 28, 33, 35, 36, 43, 45).
		Paulino insisted that the appropriate and safe volume for non-disseminated and low-grade infratentorial ependymomas is the tumor bed with a 2-cm safety margin and does not need to include the entire posterior fossa(30).
	www.annals-neurosurgery.org /Kim_B/Kim_B_et_al_2002.htm (4316 words)

	International Society for Pediatric Neurosurgery (Site not responding. Last check: 2007-10-14)
		The tumor was evacuated by infratentorial supracerebellar approach in each of 14 patients.
		One patient with cystic tumor was treated first by endoscopic marsupialization of the cyst and later by the infratentorial supracerebellar approach because the cyst recurred.
		We concluded that: (1) pineal region tumors can be safely removed by the infratentorial supracerebellar approach; (2) cases of pineal region tumors requiring adjuvant therapy can be treated successfully with a combination of surgery and adjuvant radio- and chemotherapy.
	www.ispn.org /Meetings/Aalborg/Presentation15.htm (309 words)

	Brain Tumors
		The evolution of modern microsurgical techiques have resulted in a precipitous reduction in the morbidity and mortality in the open approaches for the excision of pineal tumors.
		Packer (1984) reported no mortality in the partial resection of 24 pineal region tumors most of which were operated using a transcallosal approach, although an infratentorial approach was used in some of these.
		The infratentorial, supracerebellar approach is utilized for the majority of pineal region tumors.
	www.med.nyu.edu /neurosurgery/subspecialty/braintumors_3.html (3404 words)

	World of MS - Research - Infratentorial lesions predict long-term disability in patients with initial findings ... (Site not responding. Last check: 2007-10-14)
		World of MS - Research - Infratentorial lesions predict long-term disability in patients with initial findings suggestive of multiple sclerosis.
		Infratentorial lesions predict long-term disability in patients with initial findings suggestive of multiple sclerosis.
		summary: Results of this paper suggest that infratentorial lesions are related to long-term prognosis for patients with initial findings suggestive of multiple sclerosis and thus may help to identify patients at high risk for earlier occurrence of clinically relevant disability.
	www.ifmss.org.uk /en/research/research_news/infratentorial_l.html (74 words)

	The weight of the infratentorial portion of the adult brain and analysis of the infratentorial/whole brain weight ratio. (Site not responding. Last check: 2007-10-14)
		The weight of the infratentorial portion of the adult brain and analysis of the infratentorial/whole brain weight ratio.
		A direct relationship exists between the weights of the infratentorial portion (ITP) of the brain and the whole brain.
		With aging, the weight of the ITP decreases, but the decrease begins later and is smaller than for the forebrain.
	www.arclab.org /medlineupdates/abstract_7108567.html (197 words)

	AANS.org \| Education and Meetings \| AANS Scientific Journals \| Neurosurgical Focus
		Reid WS, Clark WK: Comparison of the infratentorial and transtentorial approaches to the pineal region.
		Spetzler RF, Daspit P, Pappas CTE: The combined supra- and infratentorial approach for lesions of the petrous and clival regions: experience with 46 cases.
		Stein BM: The infratentorial supracerebellar approach to pineal lesions.
	www.aans.org /education/journal/neurosurgical/apr98/4-4-p2.asp (3477 words)

	[No title] (Site not responding. Last check: 2007-10-14)
		Background: Systematic clinico-topographic correlation studies of infratentorial infarcts have been rare due to limitations of visualization of infratentorial structures.
		Brainstem infarct topography matched well with reported topographical arterial supply patterns, while cerebellar infarcts (larger extension of arterial territories and less homogenous infarct morphologies) were differently categorised (complete, partial territorial, circumscribed, small border zone or combined infarcts).
		Infratentorial multilocular infarcts were more frequent than previously reported in 21% (58/275) of all infarcts.
	www.archive.eurostroke.org /Valencia/v_S3_oral.asp (3516 words)

	PakMediNet - View Abstract
		Out of 116 cases, 51 (44%) were supratentorial and 65 (56%) infratentorial in location.
		In infratentorial region 38 % of the tumours were in the cerebellum, 9.5 % in the brain stem and 8.5 % in the fourth ventricle.
		Infratentorial location was more common between the age of 3-11 years (58.2%), by contrast in the under 3 years old a supratentorial location was more frequent.
	www.pakmedinet.com /view.php?id=5321 (490 words)

	[No title]
		They found that the best predictor of faster progression was the presence of two or more T2-weighted infratentorial lesions (lesions in the lower part of the brain, e.g., the cerebellum).
		Spinal cord lesions may themselves be as good or even better at predicting long-term disability; however, at the time the study began participants were not routinely given a spinal MRI.
		So for now the presence of 2+ infratentorial lesions seems to be the best predictor of long-term disability in early MS, with the prognostic value of spinal cord lesions yet to be determined.
	www.mult-sclerosis.org /news/Feb2004/LesionLocationPredictsDisabilityinPossibleMS.html (277 words)

	HON Mother & Child Glossary, Childhood Cancers: Brain Tumours
		Other than leukaemia and lymphoma, brain tumours are the most common type of cancer that occurs in children.
		Brain tumours are typically divided into Infratentorial tumours (those that occur in the lower part of the brain) and Supratentorial tumours (those that occur in the upper part of the brain).
		If a child presents symptoms that may be caused by a brain tumour, his or her doctor may order a computed tomographic (CT) scan, a diagnostic test that uses computers and x-rays to create pictures of the body.
	www.hon.ch /Dossier/MotherChild/child_cancer/cancer_braintumour.html (234 words)

	Focal Nervous System Lesions
		Brain tumors may produce obstetrical complications due to severe macrocephaly, or may present in the neonatal period as hydrocephalus, focal neurological findings, or massive bleeding.
		Supratentorial tumors in neonates occur more often than infratentorial tumors.
		Magnetic resonance imaging is the study of choice for neonates with suspected brain or spinal cord tumor.
	pediatricneuro.com /alfonso/pg257.htm (686 words)

	Brain cancer, supratentorial primitive neuroectodermal and pineal tumors, childhood: Treatment - Health Professional ...
		Genetic aberrations of supratentorial brain tumors appear to be different from those of infratentorial primitive neuroectodermal tumors (PNET, medulloblastoma).[1] Tumors may spread throughout the subarachnoid space.
		Every patient with a primitive neuroectodermal tumor or with pineoblastoma should be evaluated with diagnostic imaging of the spinal cord and whole brain.
		Prognosis is probably related to the extent of disease at diagnosis and after surgery.[2,3,4,5] Patients with cystic tumors may fare better.
	www.uhseast.com /112271.cfm (2710 words)

	IngentaConnect Infratentorial atrophy on magnetic resonance imaging and disabili... (Site not responding. Last check: 2007-10-14)
		Infratentorial atrophy on magnetic resonance imaging and disability in multiple sclerosis
		To explore further the relationship between atrophy and disability in multiple sclerosis, we estimated the volumes of infratentorial structures from MRIs in a cross-sectional study of 41 patients, 21 with relapsing-remitting multiple sclerosis and 20 with secondary progressive multiple sclerosis.
		We used the Cavalieri methods of modern design stereology with point counting to estimate the volume of brainstem, cerebellum and upper cervical spinal cord from three-dimensional MRIs acquired with an MPRAGE (Magnetization-prepared Rapid Acquisition Gradient Echo) sequence.
	www.ingentaconnect.com /content/oup/brainj/1999/00000122/00000002/art00291 (377 words)

	APSS Abstracts Search Results (Site not responding. Last check: 2007-10-14)
		No significant differences were found in age, body mass index, history of snoring or hypersomnia, stroke topography or severity between subjects with and without sleep disordered breathing.
		Prevalence and severity of breathing disturbances were similar in supra- (n=28) and infratentorial (n=11) stroke (Table 2).
		Sleep disordered breathing is frequent in acute stroke, rarely has localizing value, and can also be found in patients with mild neurologic deficits.
	www.websciences.org /cftemplate/apss97/indiv.dbm?ID=19979546 (355 words)

	allnurses.com Nursing for Nurses - Infratentorial Herniation
		Can anyone tell me what region of the brain is the infratentorial area.
		Supratentorial refers to anything above the tentorium and infratentorial refers to the structures beneath the tentorium.
		Infratentorial herniation is prognostically worse because it directly involves the brainstem and as those structures herniate, the regulation of hemodynamics and respiration becomes affected and then will cease.
	allnurses.com /forums/archive/index.php/t-79849.html (181 words)

	Childhood brain tumor : 00047 (Site not responding. Last check: 2007-10-14)
		Infratentorial tumors are those that occur in the lower part of the brain.
		These tumors may spread via the cerebrospinal fluid to other areas of the brain and spinal cord.
		Treatment for childhood infratentorial ependymoma is usually surgery to remove as much of the tumor as possible, followed by radiation therapy.
	www.acor.org /cnet/200047.html (2496 words)

	Sleep-Disordered Breathing in Patients With Acute Supra- and Infratentorial Strokes : A Prospective Study of 39 ...
		Sleep-Disordered Breathing in Patients With Acute Supra- and Infratentorial Strokes : A Prospective Study of 39 Patients -- Bassetti et al.
		Sleep-Disordered Breathing in Patients With Acute Supra- and Infratentorial Strokes
		Infratentorial strokes have been linked with central hyperventilation,
	stroke.ahajournals.org /cgi/content/full/28/9/1765 (3823 words)

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