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Topic: Choroid plexus


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  Choroid Plexus Tumor - My Child Has - Children's Hospital Boston
Choroid plexus tumors are rare, representing only 3 percent of pediatric brain tumors, but account for 10-20 percent of pediatric brain tumors that occur within the first year of life.
Diagnostic procedures for a choroid plexus tumor, like other brain tumors, are necessary to determine the exact type of tumor and whether the tumor has spread.
Choroid plexus papillomas are usually cured by surgical removal of the tumor.
www.childrenshospital.org /az/Site2138/mainpageS2138P0.html   (1230 words)

  
  IX. Neurology. 4c. The Fore-brain or Prosencephalon. Gray, Henry. 1918. Anatomy of the Human Body.
When the choroid plexus is removed, a cleft-like opening is left along the medial wall of the inferior cornu; this cleft constitutes the lower part of the choroidal fissure.
The arteries of the plexus are: (a) the anterior choroidal, a branch of the internal carotid, which enters the plexus at the end of the inferior cornu; and (b) the posterior choroidal, one or two small branches of the posterior cerebral, which pass forward under the splenium.
When the choroid plexus is pulled away, the continuity between its epithelial covering and the epithelial lining of the ventricle is severed, and a cleft-like space is produced.
www.bartleby.com /107/189.html   (13322 words)

  
 Choroid plexus - Wikipedia, the free encyclopedia
The choroid plexus is the area on the ventricles of the brain where cerebrospinal fluid (CSF) is produced by modified ependymal cells.
Choroid plexus is present in all components of the ventricular system except for the cerebral aqueduct and the occipital and frontal horns of the lateral ventricles.
There is also choroid plexus on the fourth ventricle, on the section closest to the bottom half of the cerebellum.
en.wikipedia.org /wiki/Choroid_plexus   (203 words)

  
 Choroid Plexus Cyst
The choroid plexuses are structures in the ventricles (spaces) of the brain that produce the cerebrospinal fluid.
Choroid plexus cysts are seen during 1% to 3% of all mid-trimester prenatal ultrasound examinations [1].
Choroid plexus cysts are believed to be caused by abnormal folding of the epithelium lining of the choroid plexus which traps fluid and debris [2,3].
www.obfocus.com /high-risk/birthdefects/choroidplexus.htm   (462 words)

  
 BACKGROUND   (Site not responding. Last check: 2007-10-14)
Choroid plexus tumors are defined as epithelial tumors arising from the choroid plexus of the cerebral ventricles.
Choroid plexus papilloma are composed of a simple or pseudo stratified layer of cuboidal to columnar cells resting upon a basement membrane overlying papillary, vascularized, connective tissue cords.
Choroid plexus carcinoma (Paulus 1990) is defined by histological evidence of anaplasia, e.g.
www.ucalgary.ca /~morrow/siop/background.html   (1585 words)

  
 Choroid Plexus Tumor   (Site not responding. Last check: 2007-10-14)
Choroid plexus papillomas represent about 1% of primary brain tumors in adults and about 3% of primary brain tumors in children.
Choroid plexus carcinomas are found mostly in children and usually in the lateral ventricles.
Choroid plexus tumors can be seen on both CT and MRI scans, though the latter are better for surgical planning.
www.cinn.org /tumor/diagnoses/choroidplexus.html   (346 words)

  
 choroid
Choroid plexus papilloma (CPP) was described by Guerard in 1832, and Perthes described the first successful surgical removal in 1919.
While the choroid plexus epithelium originates from the primitive medullary epithelium and therefore is related embryologically to ependyma in both structure and function, it is very different from the ependymal cells.
Patients with choroids plexus papillomas with a higher proliferation index or the presence of certain markers have been shown to have worse outcomes, generally observed as tumor recurrence.
www.thamburaj.com /choroid.htm   (1423 words)

  
 Choroid Plexus Tumors Information on Healthline
Choroid plexus tumors (CPTs) are rare abnormal growths on a part of the brain called the choroid plexus.
The choroid plexus is the structure in the brain that produces the cerebrospinal fluid that coats the brain and spinal cord.
A CPP is a benign, slow-growing, wart-like tumor that tends to grow on the surface of the choroid plexus.
www.healthline.com /galecontent/choroid-plexus-tumors   (937 words)

  
 Choroid Plexus Cysts   (Site not responding. Last check: 2007-10-14)
The choroid plexus is the tissue within the brain, which produces the cerebrospinal fluid.
Children with choroid plexus cysts are developmentally normal and indistinguishable from those in whom no cysts were seen on ultrasound examination during pregnancy.
If a fetus with choroid plexus cysts has a detailed ultrasound, including views of the heart and of hands that open and close, and shows no other abnormalities, then the risk of Trisomy 18 is only 1 in about 250.
www.wcox.com.au /choroid.htm   (457 words)

  
 uhrad.com - Body Imaging Files
Choroid plexus appears in 6th week gestation, initially in the roof of the 4th ventricle, then in the lateral ventricles, and finally in the 3rd ventricle.
Subsequently, growth of the choroid relative to that of the ventricles slows, until the choroid plexus has assumed its adult appearance by the 20th week of gestation.
Choroid Plexus Cysts are believed to derive from folding of the neuroepithelium with subsequent accumulation of CSF and debris.
www.uhrad.com /ctarc/ct019.htm   (699 words)

  
 Neuroembryology: Choroid Plexus
In the adult, cerebrospinal fluid (CSF) is formed by choroid plexus in the 1) body and inferior horns of the lateral ventricles, 2) roof of the 3rd ventricle of the diencephalon, and 3) roof of the 4th ventricle in the medulla.
Apertures in the 4th ventricle (foramina of Magendi and Luschka), which develop during the 3rd month, permit the flow of CSF from within the ventricles to subarachnoid spaces surrounding the brain and spinal cord.
The choroid fissure and its associated choroid plexus is at first on the thinned medial wall on the dorsal aspect of the developing hemisphere.
isc.temple.edu /neuroanatomy/lab/embryo_new/choroid   (180 words)

  
 Ask an Expert: Choroid plexus cysts
A choroid plexus cyst is a fluid-filled structure surrounded by normal tissue in the choroid plexus of the lateral cerebral ventricle - this is an area of the brain.
Choroid plexus cysts can be seen on ultrasound in the fetal brain during the end of the first trimester and into the second trimester of pregnancy - this can be normal.
Thus, when choroid plexus cysts are seen during pregnancy on ultrasound, it does not automatically mean the baby will be stillborn or definitely have trisomy 18 or other abnormalities.
www.netwellness.org /question.cfm/23169.htm   (419 words)

  
 AmnioNet : Brain Development I// Choroid Plexus Cysts
One of the clues to possible chromosome problems are small fluid collections in the choroid glomi, shown as a central void in the blue colored choroid visible here because the front part of the bony skull of this 12 weeker has been erased digitally.
The choroid glomus or plexus is one of the first structures to appear within the head, and it can already be seen 6 weeks after conception.
The choroid have no nerve cells, but they are critical to the development of the nerve cells that make up the cerebral hemispheres, because the sugar rich fluid that they produce is the primary ource of nourishment for developing nerve cells early in development.
www.amnionet.com /p67.htm   (317 words)

  
 Choroid plexus cyst - fetal choroid plexus cyst
Choroid plexus cyst - fetal choroid plexus cyst
The fluid produced by the cells of the choroid plexus fills the ventricles and then flows around the brain and the spinal cord to provide choroid choroid plexus cyst downs plexus cyst journal a cushion of fluid around these structures.
Choroid plexus cysts (CPCs) occur within this structure and come from fluid trapped within this spongy layer of cells, much like a soap bubble or a blister.
www.medicalgeo.com /Med-Diseases-C---Ch/Choroid-plexus-cyst.html   (466 words)

  
 Choroid Plexus Tumor   (Site not responding. Last check: 2007-10-14)
The choroid plexus papilloma is a rare, benign tumor most common in children under the age of 2.
The choroid plexus carcinoma is the malignant form of this tumor.
The prognosis for choroid plexus papilloma is excellent following a complete resection of their tumor.  No further treatment is required and long-term survival is near 100 percent.
www.stjude.org /disease-summaries/0,2557,449_2160_7268,00.html   (524 words)

  
 eMedicine - Choroid Plexus Papilloma : Article by Cheryl Ann Palmer, MD
The choroid plexus is associated with the ventricular lining of the body, trigone, and inferior horn of the lateral ventricles; the foramen of Monro; the roof of the third ventricle; and the posterior portion of the roof of the fourth ventricle.
Choroid plexus carcinomas (see Image 3) are characterized by anaplastic features such as nuclear pleomorphism and hyperchromasia, increased mitotic activity, the occurrence of tumor giant cells, tumor necrosis, and frank invasion of the underlying brain parenchyma.
Analysis of 75 pediatric cases of choroid plexus carcinomas by Fitzpatrick and colleagues (2002) also reveals the benefit of gross total tumor resection: 84% of patients with gross total resections were alive compared with 18% of patients with subtotal resections at approximately 2 years.
www.emedicine.com /med/topic2992.htm   (3127 words)

  
 choroid plexus
Bilirubin accumulation by the rabbit choroid plexus in vitro.
Butyrylcholinesterase activity in the developing auditory brainstem, the choroid plexus and the pituitary of the perinatal rat.
The choroid plexus in the rise, fall and repair of the brain.
www.arclab.org /node_pages/298.html   (727 words)

  
 Choroid Plexus Tumors - MEDSTUDENTS - Neurosurgery   (Site not responding. Last check: 2007-10-14)
The normal choroid plexus is not calcified in adults, especially in the lateral ventricle.
Indeed papillomas are seem as exaggerations of the soft pronds of normal choroid plexus that are found in the ventricles.
Choroid Plexus Papilloma and Carcinomas, in Youmans : Neurological Surgery.
www.medstudents.com.br /neuroc/neuroc5.htm   (1705 words)

  
 Dichotomous development of the organic anion transport protein in liver and choroid plexus -- Angeletti et al. 275 (3): ...
Fluorescence confocal microscopy of oatp1 in choroid plexus and liver.
Choroid plexus was taken from: 1-day-old (a), 10-wk-old (b), and adult (c) rats.
The choroid plexus serves as a major determinant of permeability of molecules into and out of the CSF (36).
ajpcell.physiology.org /cgi/content/full/275/3/C882   (3423 words)

  
 Blood Brain Barrier CSF Anatomy and Physiology   (Site not responding. Last check: 2007-10-14)
The choroid plexus forms the CSF and actively regulates the concentration of molecules in the CSF.
The preponderance of choroid plexus is distributed throughout the fourth ventricle near the base of the brain and in the lateral ventricles inside the right and left cerebral hemispheres.
While the capillaries of the choroid plexus are fenestrated, non-continuous and have gaps between the capillary endothelial cells allowing the free-movement of small molecules, the adjacent choroidal epithelial cells form tight junctions preventing most macromolecules from effectively passing into the CSF from the blood (Brightman, 1968).
users.ahsc.arizona.edu /davis/csfanatomy.htm   (407 words)

  
 Choroid Plexus Papilloma
Choroid plexus papillomas are rare, representing 0.5-0.6% of all intracranial tumors and up to 2-5% of brain tumors in childhood; they are, however, the most common choroid plexus tumors.
The tumors are frequently located in the glomus of the choroid plexus in the atrium/trigone of the lateral ventricles.
Because the choroid plexus develops embryologically from arachnoid, pia, and ependymal origins, the differential diagnosis includes choroid plexus carcinoma, interventricular meningioma, ependymoma, metastases, cavernous angioma, xanthogranuloma, and astrocytoma.
brighamrad.harvard.edu /Cases/bwh/hcache/214/full.html   (660 words)

  
 ScienceDaily.com Content: Ultrasound Clinics: Diagnosing and managing fetal choroid plexus cysts
Cysts in the choroid plexus may be found during routine sonography of the fetal brain as early as 14 weeks of gestation.
Isolated fetal choroid plexus cysts: role of ultrasonography in establishment of the risk of trisomy 18.
Choroid plexus cyst and echogenic intracardiac focus in women at low risk for chromosomal anomalies: the obligation to inform the mother.
sciencedaily.mediwire.com /main/Content.aspx?ArticleID=150158   (2329 words)

  
 Perinatal.nhs.uk
The choroid plexus is a bundle of blood vessels with can be clearly seen within the cerebral ventricles.
Choroid plexus cysts (CPCs) can be unilateral or bilateral, but are generally best seen on ultrasound in the far field – the side of the head furthest away from the scan probe.
A transverse section including both choroids should be obtained, and the image showing the CPC most clearly should be measured and recorded.
www.perinatal.nhs.uk /ultrasound/softmarkers/choroidplexuscysts.htm   (510 words)

  
 Choroid Plexus
The choroid plexus is found on the walls or roof of each of the four ventricles.
CSF is formed by the choroid plexuses which are vascular structures that project into the brain ventricles.
Part of the choroid plexus is near the pineal gland whose secretions may become calcified.
www3.umdnj.edu /histsweb/lab9/lab9choroidplexus.html   (265 words)

  
 Transepithelial Transport of Organic Anions across the Choroid Plexus: Possible Involvement of Organic Anion ...
The lysate of the isolated choroid plexus was prepared by sonicating the tissue in artificial CSF.
The lysate of isolated choroid plexus and lung (6.25 and 12.5 µg of protein, respectively) was subjected to Western blot analysis to determine the expression level of MRP1.
G in the choroid plexus were studied in vivo and in vitro.
jpet.aspetjournals.org /cgi/content/full/290/1/289   (4432 words)

  
 FOURTH VENTRICLE CHOROID PLEXUS PAPILLOMA PRESENTING ONLY WITH RHINORRHEA
The authors report a female patient with a fourth ventricle tumor which proved to be a choroid plexus papilloma after its subtotal removal.
Choroid plexus papilloma mass was enhancing diffusely, skull base was not involved (C).
Hydrocephalus is a frequent and an important consequence of choroid plexus tumors.
med.ege.edu.tr /~norolbil/1999/NBD01499.html   (1493 words)

  
 Bilateral choroid plexus cyst
Age age alone bilateral choroid plexus cyst risk bilateral choroid plexus cyst cpcs are identified.
The presence bilateral choroid plexus cyst of these bilateral choroid plexus cyst cysts seems to be associated structural abnormality where the general population.
Bilateral choroid plexus cyst org message board is now located at detecting abnormalities bilateral choroid plexus cyst then the decision they bilateral choroid plexus cyst have not.
best-cars-directory.info /choroid-plexus-cysts/bilateral-choroid-plexus-cyst.html   (328 words)

  
 The choroid plexus prevents build up of plaque related to Alzheimer's disease   (Site not responding. Last check: 2007-10-14)
Researchers have discovered that an organ in the brain called the choroid plexus apparently plays a critical role in preventing the accumulation of a protein associated with Alzheimer's disease.
The researchers found that the choroid plexus acts as a sort of "fishnet" that captures the protein, called beta-amyloid, and prevents it from building up in the cerebrospinal fluid, which surrounds and bathes the brain and spinal cord.
The findings support the theory that the choroid plexus may possess a special enzyme that breaks beta-amyloids into smaller pieces, making it possible to soak up large quantities of the protein.
www.news-medical.net /?id=16856   (772 words)

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