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Fadi Hanbali, Gregory N. Fuller, Norman E. Leeds and Raymond Sawaya

Several types of mass lesions may occur in the third and lateral ventricles. Typically they arise from the lining of the ventricular cavity or from contiguous structures, by extension into the ventricle. The authors describe two patients, each of whom presented with a different rare lesion of the ventricular system. The first was a 53-year-old woman with a history of hypertension who sustained a blunt traumatic injury to the occipital region and subsequently developed a progressively worsening right-sided headache. Radiological examinations over the next 2 years revealed an enlarged right lateral ventricle and, ultimately, a choroid plexus cyst in its anterior and middle third, near the foramen of Monro, which is a rare location for these lesions. The cyst was removed en bloc, and follow-up examinations showed a significant improvement in her headache and a minimal differences in size between right and left ventricles. The authors also describe a 57-year-old man with hypertension, diabetes mellitus, and an old mycardial infarct, who presented to an outside institution with a progressively worsening headache, generalized malaise, and loss of olfactory sensation. Diagnostic imaging revealed a 1.5-cm oval lesion centered in the lamina terminalis region, an open craniotomy was performed, and evaluation of a biopsy sample demonstrated the mass to be a chordoid glioma of the third ventricle, a recently described glioma subtype. Two days after surgery, he suffered a left parietal stroke and an anterior mycardial infarction. After convalescing, he presented to The University of Texas M. D. Anderson Cancer Center for radiotherapy and follow up; 7 months later he was readmitted complaining of headache, short-term memory loss, and worsening confusion and disorientation. Neuroimaging revealed progression of the tumor (now 2 cm in diameter), which was removed by gross-total resection. His headache resolved immediately, and 2 months later his only complaint was of episodes of confusion. Three weeks later he died of a massive myocardial infarction. These two patients represent the sixth case of an adult with a choroid plexus cyst in the anterior lateral ventricle and the 19th case of an adult with a chordoid glioma of the third ventricle, respectively.

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ventricles Hahnah Kasowski Joseph M. Piepmeier 6 2001 10 6 1 5 10.3171/foc.2001.10.6.4 FOC.2001.10.6.4 Pediatric supratentorial intraventricular tumors Daniel Y. Suh Timothy Mapstone 6 2001 10 6 1 14 10.3171/foc.2001.10.6.5 FOC.2001.10.6.5 Choroid plexus cyst and chordoid glioma Fadi Hanbali Gregory N. Fuller Norman E. Leeds Raymond Sawaya 6 2001 10 6 1 6 10.3171/foc.2001.10.6.6 FOC.2001.10.6.6 Neurosurg Focus Neurosurgical FOCUS 1092-0684 Journal of Neurosurgery Publishing Group 1 6 2001 June 2001 10 6 10.3171/foc.2001

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Simon A. Hercules, Vengalathur Ganesan Ramesh, Srinivasan Paramasivan, Pari Kodiarasan and Mohan Sampath Kumar

since been lost to follow up. Discussion Intraventricular tumors account for 10% of central nervous system neoplasms. The pathological characteristics of the tumor vary with patient age and lesion location. The most common intraventricular gliomas include ependymomas, subependymomas, and subependymal giant cell astrocytomas. Other less common varieties are chordoid gliomas, glioblastoma multiforme, and mixed glial neuronal tumors. 2 A tumor that occupies all four ventricles is extremely rare, although tetraventricular neurocytomas have been reported in adults

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Kyung Sun Song, Sung-Hye Park, Byung-Kyu Cho, Kyu-Chang Wang, Ji Hoon Phi and Seung-Ki Kim

evident in some areas of the tumor. 14 Therefore, the diagnostic procedure should differentiate it from chordoma, other variants of meningioma, and other chordoma-like tumors such as chordoid glioma. Chordomas are usually located in the midline of the central nervous system and show strong positivity for cytokeratin, S-100 protein, and EMA. Lymphoplasmacyte-rich meningiomas do not show chordoid features and often exhibit dense inflammatory cell infiltration. Chordoid glioma is usually located in the third ventricle but is strongly positive for glial fibrillary acidic

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Arthur J. Ulm, Antonino Russo, Erminia Albanese, Necmettin Tanriover, Carolina Martins, Robert M. Mericle, David Pincus and Albert L. Rhoton

16 Mokrohisky JF , Paul RE , Lin PM , Stauffer HM : The diagnostic importance of normal variants in deep cerebral phlebography. With special emphasis on the true and false venous angles of the brain and evaluation of venous angle measurements . Radiology 67 : 34 – 47 , 1956 17 Nagata S , Rhoton AL Jr , Barry M : Microsurgical anatomy of the choroidal fissure . Surg Neurol 30 : 3 – 59 , 1988 18 Nakajima M , Nakasu S , Hatsuda N , Takeichi Y , Watanabe K , Matsuda M : Third ventricular chordoid glioma: case report

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Ajit Nambiar, Ashok Pillai, Chirag Parmar and Dilip Panikar

exclusive to chordoid meningiomas. 12 Sato et al. 12 summarized the occurrence of Castleman syndrome in relation to brain tumors in 14 individuals (chordoid meningiomas in 11 and a clear cell meningioma in 1). The morphological differential diagnosis of chordoid meningioma includes chordoma, myxoid chondrosarcoma, metastatic mucinous carcinoma, and chordoid glioma. Chordomas show a strong positivity for cytokeratin, EMA, and often S100 protein staining. Chordoid gliomas are GFAP positive and EMA negative. Chordoid meningiomas, in contrast, are positive for EMA and

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Melanie G. Hayden Gephart, Robert M. Lober, Robert T. Arrigo, Corinna C. Zygourakis, Raphael Guzman, Maxwell Boakye, Michael S. B. Edwards and Paul G. Fisher

death certificate–only cases. For both cohorts, we identified microscopically confirmed tumor cases in all actively followed pediatric patients (age ≤ 19 years at diagnosis), using the International Classification of Diseases for Oncology, 3rd Edition (ICD-O-3) primary site codes for spinal meninges (C70.1), spinal cord (C72.1), or cauda equina (C72.1) crossed with ICD-O-3 histology codes for various primary glial tumors (ICD-O-3 9380–9489). Twenty cases of primitive neuroectodermal tumor (ICD-O-3 9473) and 1 case each of chordoid glioma (ICD-O-3 9444) and

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Todd C. Hankinson, Roy W. R. Dudley, Michelle R. Torok, Mohana Rao Patibandla, Kathleen Dorris, Seerat Poonia, C. Corbett Wilkinson, Jennifer L. Bruny, Michael H. Handler and Arthur K. Liu

.07 0 0.00 9538/1: Clear cell meningioma 4 0.07 0 0.00 9538/3: Papillary meningioma 4 0.07 0 0.00 9150/3: Hemangiopericytoma, malignant 3 0.05 2 0.63 9352/1: Papillary craniopharyngioma 3 0.05 0 0.00 9393/3: Papillary ependymoma, NOS 3 0.05 0 0.00 9444/1: Chordoid glioma 3 0.05 1 0.31 9490/0: Ganglioneuroma 3 0.05 0 0.00 9560/3: Neurilemmoma, malignant 3 0.05 0 0.00 9070/3: Embryonal carcinoma, NOS 2 0.04 0 0.00 9071/3: Yolk sac tumor 2 0.04 0 0

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Kristin J. Weaver, Lexi M. Crawford, Jeffrey A. Bennett, Marie L. Rivera-Zengotita and David W. Pincus

A ngiocentric glioma, first identified in 2005, is a rare type of brain tumor that predominantly affects children and young adults. 4 , 9 In 2007, the WHO Classification of Tumours of the Central Nervous System 5 officially recognized this tumor as a distinct clinicopathological entity where it was grouped with astroblastoma and chordoid glioma of the third ventricle in the category of “other neuroepithelial tumours.” It was classified as WHO Grade I due to its benign clinical behavior and possibility for a surgical cure. 1 To date, approximately 65 cases of