Accessory intraventricular prominence of the occipital horn of the lateral ventricle

2003 ◽  
Vol 99 (1) ◽  
pp. 151-155 ◽  
Author(s):  
Giovani Vandewalle ◽  
Emile Beuls ◽  
Linda Vanormelingen ◽  
Marjan Vandersteen
Keyword(s):  
Lateral Ventricle ◽  
Posterior Part ◽  
Morphological Features ◽  
Medial Wall ◽  
Endoscopic Neurosurgery ◽  
Content Type ◽  
Close Relationship ◽  
Relationship Of ◽  
Occipital Horn ◽  
Fine Print

Object. Knowledge of normal variations in ventricular morphological features is important in endoscopic neurosurgery. Classically, two elevations are described on the medial wall of the occipital horn of the lateral ventricle: an upper bulb and a lower calcar avis. Nevertheless, a third, as yet unreported elevation may be present at the junction of the medial wall and the floor of the occipital horn. The authors report the frequency with which this third elevation was found in a series of cadaveric brains. Methods. The medial wall of the occipital horn of the lateral ventricle was studied in the three orthogonal planes in 45 formalin-fixed cadaveric hemispheres. The underlying structures responsible for the observed intraventricular prominences were exposed by microdissection. A third elevation was present, lying ventrorostral to the calcar avis, in seven (47%) of the 15 single hemispheres, and bilaterally in six (40%) of the 15 whole brains. After microdissection, a fiber bundle from the splenium of the corpus callosum was seen emerging in the occipital horn at the angle between the tail of the hippocampus and the bulb of the occipital horn. The most rostral fibers fanned out inferolaterally along the floor of the collateral trigone. The larger, posterior part protruded into the medial wall along the ventral border of the calcar avis as far as the tip of the occipital horn. Conclusions. Besides its importance as a variation of normal ventricular morphological features, the close relationship of this accessory intraventricular prominence to the tail of the hippocampus should be kept in mind when intervening neurosurgically so that damage to the underlying commissural fibers can be avoided.

Acinar choroid plexus adenoma

1970 ◽  
Vol 33 (5) ◽  
pp. 587-590 ◽  
Author(s):  
Richard L. Davis ◽  
Gerald E. Fox
Keyword(s):  
Choroid Plexus ◽  
Lateral Ventricle ◽  
Content Type ◽  
Cystic Tumors ◽  
Complications Of Surgery ◽  
The Right ◽  
Relationship Of ◽  
The Relationship ◽  
Symptoms And Signs ◽  
Fine Print

✓ Mucin-producing cystic tumors of the choroid plexus are rare and most are papillomas or carcinomas. An acinar choroid plexus adenoma of the right lateral ventricle is described. Symptoms and signs included headache, vomiting, papilledema, and a gait disturbance. The neoplasm was located with ventriculography and totally removed, but the patient died of complications of surgery. The relationship of this tumor to others arising in the choroid plexus is discussed.

Diverticulum of the lateral ventricle causing cerebellar ataxia

1983 ◽  
Vol 59 (5) ◽  
pp. 895-898 ◽  
Author(s):  
Susumu Wakai ◽  
Junichi Narita ◽  
Kazumasa Hashimoto ◽  
Masakatsu Nagai
Keyword(s):  
Cerebellar Ataxia ◽  
Computerized Tomography ◽  
Posterior Fossa ◽  
Ventriculoperitoneal Shunt ◽  
Lateral Ventricle ◽  
Medial Wall ◽  
Content Type ◽  
Ventricular Diverticulum ◽  
Fine Print

✓ A case of ventricular diverticulum causing cerebellar ataxia is presented. Computerized tomography clearly demonstrated the aperture of the diverticulum in the medial wall of the trigone and its extension into the posterior fossa. The diverticulum regressed and the cerebellar ataxia disappeared after placement of a ventriculoperitoneal shunt.

Frameless neuronavigation in intracranial endoscopic neurosurgery

2001 ◽  
Vol 94 (1) ◽  
pp. 72-79 ◽  
Author(s):  
Henry W. S. Schroeder ◽  
Wolfgang Wagner ◽  
Wolfgang Tschiltschke ◽  
Michael R. Gaab
Keyword(s):  
Third Ventricle ◽  
Colloid Cyst ◽  
Endoscopic Approach ◽  
Arachnoid Cysts ◽  
Tumor Biopsy ◽  
Foramen Of Monro ◽  
Endoscopic Neurosurgery ◽  
Content Type ◽  
Multiloculated Hydrocephalus ◽  
Fine Print

Object. Frameless computerized neuronavigation has been increasingly used in intracranial endoscopic neurosurgery. However, clear indications for the application of neuronavigation in neuroendoscopy have not yet been defined. The purpose of this study was to determine in which intracranial neuroendoscopic procedures frameless neuronavigation is necessary and really beneficial compared with a free-hand endoscopic approach. Methods. A frameless infrared-based computerized neuronavigation system was used in 44 patients who underwent intracranial endoscopic procedures, including 13 third ventriculostomies, nine aqueductoplasties, eight intraventricular tumor biopsy procedures or resections, six cystocisternostomies in arachnoid cysts, five colloid cyst removals, four septostomies in multiloculated hydrocephalus, four cystoventriculostomies in intraparenchymal cysts, two aqueductal stent placements, and fenestration of one pineal cyst and one cavum veli interpositi. All interventions were successfully accomplished. In all procedures, the navigational system guided the surgeons precisely to the target. Navigational tracking was helpful in entering small ventricles, in approaching the posterior third ventricle when the foramen of Monro was narrow, and in selecting the best approach to colloid cysts. Neuronavigation was essential in some cystic lesions lacking clear landmarks, such as intraparenchymal cysts or multiloculated hydrocephalus. Neuronavigation was not necessary in standard third ventriculostomies, tumor biopsy procedures, and large sylvian arachnoid cysts, or for approaching the posterior third ventricle when the foramen of Monro was enlarged. Conclusions. Frameless neuronavigation has proven to be accurate, reliable, and extremely useful in selected intracranial neuroendoscopic procedures. Image-guided neuroendoscopy improved the accuracy of the endoscopic approach and minimized brain trauma.

Meningiomas arising from the falcotentorial junction

1995 ◽  
Vol 82 (5) ◽  
pp. 726-738 ◽  
Author(s):  
Shoji Asari ◽  
Tomohide Maeshiro ◽  
Susumu Tomita ◽  
Masamitsu Kawauchi ◽  
Nobuyoshi Yabuno ◽  
...  
Keyword(s):  
Surgical Treatment ◽  
Mr Imaging ◽  
Superior Sagittal Sinus ◽  
Posterior Part ◽  
Detailed Knowledge ◽  
Content Type ◽  
Sagittal Sinus ◽  
Adjacent Structures ◽  
Upward Gaze Palsy ◽  
Fine Print

✓ Meningiomas arising from the falcotentorial junction are extremely rare. The authors describe the clinical features, neuroimaging studies, and results of surgical treatment of meningiomas of the falcotentorial junction and clarify the characteristics of this lesion based on a review of the literature and seven patients treated at their institution. The most common symptoms resulted from intracranial hypertension. Upward-gaze palsy appeared in only one patient. Computerized tomography (CT) showed no specific findings, but there was no evidence of edema around the tumor. Magnetic resonance (MR) imaging revealed a round, smooth-bordered mass with a peritumoral rim, without edema, and showing marked contrast enhancement. The multiplanar capability of MR imaging delineated the relationship between the tumor and adjacent structures better than did CT. Detailed knowledge of the vascular structures, especially evidence of occlusion of the galenic venous system and the development of collateral venous channels, is critical for successful surgery; stereoscopic cerebral angiography is necessary to achieve this aim. The seven patients described developed five types of collateral venous channels: through the basal vein of Rosenthal to the petrosal vein, through the veins on the medial surface of the parietal and occipital lobes to the superior sagittal sinus, through superficial anastomotic veins, through veins of the posterior fossa to the transverse or straight sinus, and through the falcian veins to the superior sagittal sinus. The first three types mainly developed after occlusion of the galenic system. The tumors were removed through the occipital transtentorial approach with a large window at the posterior part of the falx. A favorable prognosis for patients undergoing surgical treatment of falcotentorial junction meningiomas can be expected if detailed neuroimaging studies and microsurgical techniques are used.

Accessory cerebral ventricle of the occipital lobe

1984 ◽  
Vol 61 (4) ◽  
pp. 767-771 ◽  
Author(s):  
Akira Hori ◽  
Attila Bardosi ◽  
Koji Tsuboi ◽  
Yutaka Maki
Keyword(s):  
Brain Volume ◽  
Occipital Lobe ◽  
Ependymal Cells ◽  
Content Type ◽  
Ependymal Layer ◽  
Calcarine Fissure ◽  
Capillary Degeneration ◽  
Occipital Horn ◽  
Fine Print ◽  
Marked Atrophy

✓ Small separated accessory ventricles in the occipital lobe were observed in 21.3% of 404 patients, as seen by computerized tomogram. There was no significant preponderance in regard to sex or laterality. The accessory ventricles were clinically not significant. As seen at autopsy, accessory ventricles were found in the subcalcarine white matter, posterior to the occipital horn of the lateral ventricle, in 29.5% of 200 “normal” brains. Again, there were no significant sex and laterality differences. Accessory ventricles were never found in brains of fetuses or newborn babies. The youngest child in whom an accessory ventricle was found was 1 month old. No accessory ventricles were larger than 1 cm in diameter; they were slit-like, triangular or oval in shape. Histologically, they showed subtotal loss of the ependymal layer, subependymal gliosis, and/or fibrosis, and, in some cases, hyalinofibrotic capillary degeneration. Electron microscopy of the remaining ependymal cells in the accessory ventricle showed marked atrophy. Accessory ventricles are formed at the tip of the occipital horn postnatally through the expansion of the deep calcarine fissure, increase in brain volume in the region, and subsequent fusion of the mediolateral ventricular walls.

Malignant intraventricular schwannoma

1995 ◽  
Vol 82 (1) ◽  
pp. 121-124 ◽  
Author(s):  
Jin-Myung Jung ◽  
Hyung-Jin Shin ◽  
Je G. Chi ◽  
In Sung Park ◽  
Eun Sang Kim ◽  
...  
Keyword(s):  
Lateral Ventricle ◽  
Malignant Schwannoma ◽  
Pathological Features ◽  
Content Type ◽  
The Right ◽  
Subtotal Removal ◽  
Fine Print

✓ The authors present the clinical, radiological, and pathological features of a malignant schwannoma occurring in the right lateral ventricle of a 40-year-old man. Metastasis to both cerebellopontine angles and to the cerebellum was found 7 months after subtotal removal of the tumor.

Long-term effects of in vivo angioplasty in normal and vasospastic canine carotid arteries: pharmacological and morphological analyses

1999 ◽  
Vol 91 (1) ◽  
pp. 100-108 ◽  
Author(s):  
Joseph F. Megyesi ◽  
Bozena Vollrath ◽  
David A. Cook ◽  
Ming H. Chen ◽  
J. Max Findlay
Keyword(s):  
Functional Impairment ◽  
Time Course ◽  
Calcium Ionophore ◽  
Morphological Features ◽  
Long Term Effects ◽  
Pharmacological Agents ◽  
Content Type ◽  
High Cervical ◽  
Fine Print

Object. A canine model of hemorrhagic vasospasm of the high cervical internal carotid artery (ICA) was used to study the long-term effects of transluminal balloon angioplasty (TBA) on the structure and function of the arterial wall.Methods. Forty dogs underwent surgical exposure of both distal cervical ICAs, followed by baseline angiographic studies on Day 0. Dogs in Group A (20 animals) underwent simple exposure of one ICA and placement of a silicone elastomer cuff around a segment of the opposite artery. These animals underwent repeated angiography on Day 7, and then TBA was performed on the uncuffed ICA; the cuff was removed from the opposite vessel. For dogs in Group B (20 animals), blood clot—filled cuffs were placed around both ICAs, and on Day 7 angiography was repeated and TBA was performed on one randomly selected ICA. Four animals were then killed from each group, and in the remaining animals the cuffs were removed from both ICAs. On Days 14, 21, 28, and 56, four animals from each group underwent repeated angiography and were then killed to permit pharmacological and morphological analyses of the ICAs. This protocol yielded five study categories: cuffed nonblood-coated arteries not subjected to TBA, blood-coated arteries not subjected to TBA, blood-coated arteries subjected to TBA, normal arteries subjected to TBA, and control arteries obtained from the proximal ICA in each animal. The contractile responses of isolated arterial rings obtained from each ICA were recorded after treatment with potassium chloride, noradrenaline, and serotonin, whereas relaxations in response to the calcium ionophore A23187 and papaverine were recorded after tonic contraction to noradrenaline had been established. Morphological analysis was performed using scanning electron microscopy.Arteries surrounded by an empty cuff exhibited no angiographic, pharmacological, or morphological differences compared with normal arteries on any study day. Arteries surrounded by blood developed angiographically confirmed vasospasm on Day 7, with characteristic pharmacological and morphological features; resolution of these symptoms occurred by Day 21. Vasospastic arteries subjected to TBA on Day 7 remained dilated on angiographic studies, exhibited impaired responses to pharmacological agents (except for papaverine), and showed altered morphological features until Day 28. Normal arteries subjected to TBA on Day 7 remained dilated on angiographic studies, exhibited impaired responses to pharmacological agents (except for papaverine), and displayed altered morphological features until Day 14.Conclusions. These results indicate that the canine high cervical ICA model produces consistent and reproducible vasospasm that follows a similar time course to that seen in humans. When TBA is performed in vasospastic arteries, it results in an immediate functional impairment of vascular smooth muscle that lasts for 2 weeks, with resolution at 3 weeks; morphological changes are mostly resolved 3 weeks post-TBA. In normal vessels, TBA causes functional impairment and morphological alterations that are not as severe or as long-lasting as those seen in vasospastic arteries.

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.

Contralateral ventricular dilatation in supratentorial tumors

1981 ◽  
Vol 54 (4) ◽  
pp. 509-512 ◽  
Author(s):  
Gordon F. G. Findlay ◽  
Brian H. Cummins
Keyword(s):  
Clinical Condition ◽  
Lateral Ventricle ◽  
Ventricular Dilatation ◽  
Ct Scans ◽  
Content Type ◽  
Level Of Consciousness ◽  
Supratentorial Tumors ◽  
Fine Print

✓ The computerized tomographic (CT) scans of 411 patients with supratentorial lateralized tumors were compared with an assessment of their clinical condition. More than one-third of these patients showed dilatation of the contralateral lateral ventricle, which was associated with a lower level of consciousness.

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.

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