1/79. choroid plexus papilloma. I. Proof of cerebrospinal fluid overproduction.Utilizing a ventricular perfusion technique, the rate of CSF formation was determined in a 2-year-old child before and after removal of a 74 g choroid plexus papilloma from the left lateral ventricle. Preoperatively, the CSF formation rate was 1.05 /- SD 0.01 ml/min (1,656 ml/day). Postoperatively, the CSF formation rate was reduced fivefold to 0.20 /- SD 0.01 ml/min (288 ml/day). Whereas these data are regarded as conclusive evidence of CSF overproduction by a choroid plexus papilloma, the pathogenesis of generalized ventricular enlargement in this case was due to part to obstruction of the subarachnoid pathways.- - - - - - - - - - ranking = 1keywords = choroid plexus, choroid plexus papilloma, plexus papilloma, choroid, papilloma, plexus (Clic here for more details about this article) |
2/79. Ruptured distal anterior choroidal artery aneurysm presenting with casting intraventricular haemorrhage.This report describes a rare case of a distal anterior choroidal artery aneurysm which developed intraventricular haemorrhage without subarachnoid haemorrhage as shown on computerized tomographic (CT) scan. A 69-year-old hypertensive man suddenly became unconscious. An emergency CT scan showed a severe intraventricular haemorrhage and a small round low-dense lesion within the haematoma at the right trigone. The haematoma with obstructive hydrocephalus made the lateral ventricles larger on the right than on the left. CT scan could not detect any subarachnoid haemorrhage. Right interal carotid angiography revealed a saccular aneurysm at the plexal point of the right anterior choroidal artery. We approached the aneurysm and the small round lesion through the trigone via a right temporo-occipital corticotomy. We could clip the aneurysmal neck and remove the intraventricular haematoma and the papillary cystic mass (corresponding to the small round lesion on CT scan) totally in one sitting. Histological examination revealed the aneurysm to be a true one and the papillary cystic mass to be a choroid plexus cyst.- - - - - - - - - - ranking = 0.27482246624337keywords = choroid plexus, choroid, plexus (Clic here for more details about this article) |
3/79. Normal rate of cerebrospinal fluid formation five years after bilateral choroid plexectomy. Case report.A ventricular perfusion technique was used to determine the rate of cerebrospinal fluid (CSF) formation in a 5-year-old child who had undergone bilateral choroid plexectomy for communicating hydrocephalus during infancy. At the time of the study, the patient had a failed ventriculoperitoneal shunt and was suffering from progressive ventriculomegaly. The calculated rate of CSF formation, 0.35 ml/min /- 0.02 standard deviation, was within normal limits.- - - - - - - - - - ranking = 0.063907004379688keywords = choroid (Clic here for more details about this article) |
4/79. Blake's pouch cyst: an entity within the Dandy-Walker continuum.Abnormal cerebrospinal fluid (CSF) collections within the posterior fossa are defined by the Dandy-Walker complex (DWC) and by arachnoid cysts (AC). The DWC includes the Dandy-Walker malformation (DWM), the Dandy-Walker variant (DWV) and the mega-cisterna magna (MCM). In addition, Tortori-Donati et al. added persistent Blake's pouch cyst (BPC) as an independent entity within the DWC. BPC represents a posterior ballooning of the superior medullary velum into the cisterna magna. All of these malformations are overlapping developmental anomalies characterized by varying degrees of malformation of the medullary vela, the cerebellar vermis and hemispheres, the fourth ventricle choroid plexus, the posterior fossa subarachnoid cisterns and the enveloping meningeal structures. We present two cases of persistent BPC detected in two adult women without history of gestational or subsequent growth problems. They underwent neuroradiological investigation because of headache and because of recurrent episodes of loss of consciousness, respectively. The MRI findings included tetraventricular hydrocephalus, wide communication of the fourth ventricle and the cystic posterior fossa (i.e. BPC), inferior posterior fossa mass effect with or without hypoplasia of both the cerebellar vermis and the medial aspects of the cerebellar hemispheres, and absence of communication between fourth ventricle and the basal subarachnoid space in the midline posteriorly. Persistent BPC is defined by a failure of embryonic assimilation of the area membranacea anterior within the tela choroidea associated with imperforation of the foramen of Magendie. Typically this condition becomes symptomatic early in life. In the current cases the normal function of the laterally positioned foramina of Luschka probably helped to maintain some CSF flow between intraventricular and subarachnoid spaces, with the establishment of a precarious equilibrium characterized by a compensatory enlargement of the cerebral ventricular system (i.e. hydrocephalus).- - - - - - - - - - ranking = 0.21091546186368keywords = choroid plexus, choroid, plexus (Clic here for more details about this article) |
5/79. Endoscopically guided fenestration of the choroidal fissure for treatment of trapped temporal horn.In recent years endoscopic procedures have been used more frequently to treat loculated hydrocephalus. The trapped temporal horn, a specific type of loculation, has traditionally been treated by means of ventricular shunt placement. By opening up loculations, however, this procedure can be simplified or, in some cases, even avoided. In this report the author discusses a case of trapped temporal horn that was caused by fungal meningitis and treated using endoscopically guided fenestration of the choroidal fissure, leading to clinical and radiographic resolution of the syndrome. Using this simple procedure allows the surgeon to take advantage of normal temporal horn anatomy and landmarks, avoiding the scarred and distorted region of ventricular obstruction.- - - - - - - - - - ranking = 0.063907004379688keywords = choroid (Clic here for more details about this article) |
6/79. Intraventricular hemorrhage in neonates: endoscopic findings and treatment by the use of our newly developed Yamadori-type 8 ventriculoscope.Profound intraventricular hemorrhage (IVH) has devastating effects on neonates, leading to significant neurodevelopmental morbidity. We have developed a flexible fiberoptic ventriculoscope (Yamadori-type 8), which has a conspicuously high resolving power and is equipped with a bipolar coagulator and a working channel for irrigation. Four neonates with IVH were examined and treated for the first time using the flexible ventriculoscope. The patients had grade III or IV IVH on computed tomography scans and received endoscopic operations three to four weeks after birth. In patients with IVH, fragments of old hematomas were observed as brown masses because of the presence of hemosiderin, a characteristic endoscopic finding. We have found, for the first time, IVH due to rupture of the varices of septal veins, which could be cauterized endoscopically. hydrocephalus was relieved by irrigation, third ventriculostomy, coagulation of the choroid plexus, and adequate placement of ventriculoperitoneal shunting was performed endoscopically. The flexible ventriculofiberscope could be a useful modality for early treatment of IVH in neonates because of the minimal invasiveness. The pathogenesis of IVH should be reviewed to include septal vein varices as a possible cause of IVH.- - - - - - - - - - ranking = 0.19813406098774keywords = choroid plexus, choroid, plexus (Clic here for more details about this article) |
7/79. Disseminating histologically benign multiple papilloma of the choroid plexus: case report.A rare case of extensively disseminating multiple benign choroid plexus papilloma is shown. The patient first reported with high-grade hydrocephalus and two tumours in the 3rd and 4th ventricle was treated by atrioventricular shunt insertion, subtotal resection of the 4th ventricle tumour, and adjuvant 60Co irradiation of the posterior fossa. The dissemination that followed was revealed by computerised tomography and magnetic resonance imaging, and involved both the supra- and infratentorial ventricular systems, spinal canal, and brain parenchyma. Three years after the resection of the 4th ventricle tumour, the patient underwent excision of a temporal lobe lesion for relief of neurological symptoms, but showed no improvement and died 5 years after the primary diagnosis of CNS tumour. An autopsy was not performed. Analysis of the primarily resected mass showed distinct papillary pattern with no anaplasia, mitoses, multinucleation orgiant cell formation, and cytokeratin positivity at the absence of vimentin and glial fibrillary acidic protein. Analysis ofthe temporal lobe tumour again showed definite papillary formation with no signs of malignisation and virtually no mitotic figures, and the presence of cytokeratin, but not vimentin or glial fibrillary acidic protein. On both occasions, the diagnosis was choroid plexus papilloma (WHO grade I).- - - - - - - - - - ranking = 1.5582766139341keywords = choroid plexus, choroid plexus papilloma, plexus papilloma, choroid, papilloma, plexus (Clic here for more details about this article) |
8/79. Acute unilateral hydrocephalus resulting from oedematous occlusion of foramen of Monro: complication of intraventricular surgery.Transcerebral removal of a small choroid plexus papilloma in the region of the foramen of Monro was followed within 48 hours by severe and progressive unilateral hydrocephalus. Acute unilateral hydrocephalus is a hitherto unrecognized complication of intraventricular surgery.- - - - - - - - - - ranking = 0.3765419530016keywords = choroid plexus, choroid plexus papilloma, plexus papilloma, choroid, papilloma, plexus (Clic here for more details about this article) |
9/79. Unusual small choroid plexus cyst obstructing the foramen of monroe: case report.This is a case report of unusual case of choroid plexus cyst at the right foramen of Monro in the anterior third ventricle that caused unilateral obstructive hydrocephalus. The value of small-FOV thin-section MR imaging in the diagnosis of small lesions of the foramen of Monroe is demonstrated. The immunohistochemical findings in choroid epithelial cysts in comparison with those of other types of cysts at this location are discussed.- - - - - - - - - - ranking = 1.0034517058147keywords = choroid plexus, choroid, plexus (Clic here for more details about this article) |
10/79. choroid plexus papilloma and aicardi syndrome: case report.A case of aicardi syndrome associated with a choroid plexus papilloma of the third and both lateral ventricles in a 15 months old baby girl is repported. The tumor was completely removed via three craniotomies. Reports of the literature with the association of choroid plexus papilloma and aicardi syndrome are rare. We suggest that children diagnosed with aicardi syndrome should routinely undergo imaging studies of the brain, such as computed tomography or magnetic resonance.- - - - - - - - - - ranking = 1keywords = choroid plexus, choroid plexus papilloma, plexus papilloma, choroid, papilloma, plexus (Clic here for more details about this article) |
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