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Ashok Pillai, Kariyattil Rajeev, Sushil Chandi and Muthukuttiparambil Unnikrishnan

Microscopic examination revealed a tumor with a papillary structure composed of a single layer of well-differentiated columnar/cuboidal epithelial cells mounted on fibrovascular cores ( Fig. 3 ). There was no cellular atypia and the mitotic index was low. A diagnosis of choroid plexus papilloma was made. Fig. 3. Photomicrograph of a tumor section composed of benign epithelial cells mounted on papillary fibrovascular cores. H & E, original magnification × 10. Postoperative Course In light of the risk of recurrence caused by residual tumor, a trial of

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Alexander Tuchman, Stephen P. Kalhorn, Irina Mikolaenko and Jeffrey H. Wisoff

C horoid plexus papilloma is an intraventricular papillary neoplasm derived from the epithelium of the choroid plexus. The location of a choroid plexus papilloma in the third ventricle is rare compared with the more common sites in the lateral and fourth ventricles. 8 A cystic choroid plexus papilloma represents an infrequent subtype of choroid plexus papilloma that may present diagnostic uncertainty. 5 , 6 In this report, the authors present a case of a cystic choroid plexus papilloma within a cavum septum pellucidum that radiographically mimicked

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Benjamin S. Carson, Jon D. Weingart, Michael Guarnieri and Paul G. Fisher

C horoid plexus tumors are uncommon, representing approximately 0.5% of intracranial tumors in all age groups: 1 to 4% in children and 10 to 12% in infants younger than 1 year of age. 5, 7, 9, 14, 17, 21, 29, 31–33, 35 Choroid plexus neoplasms typically arise in the lateral ventricle. In adults, tumors are found in the fourth and third ventricle, and less frequently, the cerebellopontine angle. Most tumors are classified as benign choroid plexus papillomas on histological examination; 10 to 30% are classified as malignant choroid plexus carcinomas. 8, 17, 26

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Anqi Xiao, Jianguo Xu, Xin He and Chao You

. The mass was smaller with reduced mass effect. The right side of the prepontine cistern was wider than on preoperative images, and the normal morphology of the fourth ventricle was restored. Discussion Choroid plexus papilloma is a rare tumor that develops from choroid plexus epithelial cells, accounting for 0.4%–0.6% of all primary brain tumors. 6 , 13 It typically occurs in the ventricular system. The lateral ventricle trigone is the most common location in children, whereas the fourth ventricle is more likely to be involved in adults; occurrence in the

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Renzo Boldorini, Gabriele Panzarasa, Paola Girardi and Guido Monga

C horoid plexus papillomas are uncommon neuroectodermal tumors of the CNS (0.5% of all adult intracranial tumors) that are mainly located in the lateral ventricles in children and the fourth ventricle in adults. 11 Approximately 25% of choroid plexus tumors are malignant and show a propensity for local recurrence, brain invasion, and dissemination along the CSF pathways, 9 whereas choroid plexus papillomas recur only rarely, but may sometimes seed cells into the CSF that become implanted in the subarachnoid space. 7 , 12 The extraventricular growth of a

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Howard M. Eisenberg, J. Gordon McComb and Antonio V. Lorenzo

I t is generally assumed that choroid plexus papillomas are associated with overproduction of cerebrospinal fluid (CSF). 7, 9, 11 Documentation of this overproduction has depended on continuous drainage to measure CSF formation. 3, 6, 15 Rates determined by this method, however, may be in error since during the collection period the amount of fluid absorbed is unknown and the CSF volume might not remain constant. In addition, whether the diffuse ventricular dilatation that is frequently associated with these tumors 5, 12 can occur in the face of a normal

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Hong Yu, Tom L. Yao, John Spooner, Jennifer R. Stumph, Ray Hester and Peter E. Konrad

of choroid plexus papilloma drop metastases in a man who presented almost 20 years after gross-total resection of his intracranial primary tumor. Case Report History. This 49-year-old man presented to our center with a 1-year history of sharp low-back pain, which radiated down both hips and extended to his right knee. He denied any bowel or bladder dysfunction. The patient had undergone gross-total resection of a posterior fossa choroid plexus papilloma 19 years previously at another institution. He had received neither chemotherapy nor radiation

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Mahmoud G. Naguib, Shelley N. Chou and Angeline Mastri

C horoid plexus papillomas are generally believed not to be sensitive to radiation therapy. A case is presented in which a large left cerebellopontine angle tumor was found associated with bone destruction. On histological examination, it was identified as a choroid plexus papilloma. Due to its extreme vascularity and its location, gross resection was not possible. A course of radiation therapy was given, with excellent results. Case Report This 29-year-old man was brought to the neurosurgical service for evaluation of recent x-ray evidence of petrous

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Nitya R. Ghatak and Joe M. McWhorter

. 2 ). Fig. 1. Photomicrograph of the choroid plexus tumor with branching papillary structure consisting of epithelial cells abutting on loose vascular stroma. H & E, × 120. Fig. 2. Electron micrograph of the choroid plexus papilloma showing epithelial cells resting on basement membrane separated from capillary lumen (L) by attenuated endothelium (e), pericyte (P) and collagen-containing extracellular space (Ex). Note numerous villi on free margins. × 4200. The epithelial cells contained centrally located nuclei with evenly dispersed

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Özlem Kurtkaya-Yapicier, Bernd W. Scheithauer, Karl Peter Van Peteghem and John E. Sawicki

reported cases of disseminated choroid plexus papilloma, dissemination is primarily within the spinal subarachnoid space. 5, 16, 25 We describe a unique case of an entirely benign, extradural choroid plexus papilloma of the sacral canal. Its location suggests it may have arisen from ectopic choroid plexus or by metaplasia of ependymal rests. To our knowledge, extraneural choroid plexus papilloma has not been previously reported. Case Report Examination This 50-year-old woman with no history of tumor presented with a 4-month history of increasing right buttock