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George J. Dohrmann and James C. Collias

P rimary carcinoma of the choroid plexus is rare. In 1844, Rokitansky 30 described a medullary tumor arising from the choroid plexus. Approximately 60 cases have been reported as choroid plexus carcinoma since then, but the validity of some of these diagnoses remained in doubt. Many of these cases did not fulfill the histological criteria of primary carcinoma of the choroid plexus. The remainder were papillomas, other malignant neoplasms, or secondary carcinomas. The purpose of this paper is twofold: 1) to review and analyze previously published cases of

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Richard L. Davis and Gerald E. Fox

T umors of choroid plexus epithelium are rare lesions. They constituted 0.5% to 0.6% of Zulch's cases 8 and 2% of the gliomas in Russell and Rubinstein's series. 5 All of these cases fall into the group of choroid plexus papilloma and carcinoma. Even rarer are cystic lesions, apparently deriving from choroid plexus epithelium, with a lining of obviously secretory (mucinous) cells. 1 We have had the opportunity to study a peculiar tumor, apparently unique, which seemingly arose from the choroid plexus of the trigone of the right lateral ventricle. This

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Charles J. Hodge Jr. and Robert B. King

V ascular malformations of the choroid plexus are an unusual cause of subarachnoid hemorrhage. This case serves to point out some of the clinical characteristics of arteriovenous malformations of the choroid plexus. Case Report A 22-year-old right-handed woman was transferred to State University Hospital following her second subarachnoid hemorrhage. She had been well until 2 years prior to admission when she experienced the first subarachnoid hemorrhage, characterized by headache, stiff neck, and confusion. Bilateral carotid angiography was normal. She

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Robert A. Beatty

A wide variety of tumors arising from the vascular core or stroma of the choroid plexus has been described. These include meningioma, sarcoma, angioma, chondroma, lipoma, teratoma, simple cyst, and xanthoma. 10 However, tumors arising from the choroid plexus epithelium are decidedly rare, and have included papilloma, carcinoma, and recently, acinar adenoma. 3, 14 The present report describes a patient with a malignant melanoma arising from the epithelium of the choroid plexus in the lateral ventricle. Case Report One month before admission this 8

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Kosuke Miyahara, Kazuhiko Fujitsu, Saburo Yagishita, Yasunori Takemoto, Teruo Ichikawa, Shigeo Matsunaga, Yukihiro Takeda, Hitoshi Niino, and Takeki Shiina

I nflammatory pseudotumor has been most frequently described in the lung, and primary central nervous system involvement is relatively rare. In this report, we present a case of inflammatory pseudotumor that developed in the choroid plexus of the lateral ventricle. Case Report History This 73-year-old man's physical activity slowly decreased beginning in December 2004. Gait disturbance and right hemiparesis appeared in January 2005, and the patient was admitted to our department on January 17. In terms of his medical history, the patient had

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Primary pigmented carcinoma of the choroid plexus

A light and electron microscopic study

Marco A. Lana-Peixoto, Julio Lagos, and Shirley W. Silbert

A lthough primary tumors of the choroid plexus have been widely reported in the literature, few cases seem to fulfill the criteria of malignancy as suggested by Russell and Rubinstein 32 and Lewis. 23 Furthermore, to our knowledge, only one example of malignant melanoma of the choroid plexus epithelium has been reported. 4 We have had the opportunity to study a pigmented neoplasm arising from the choroid plexus epithelium with obvious malignant features and widespread subarachnoid, cerebral, and extraneural metastases. The present report describes the

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José Pimentel, Adília Costa, and Luís Távora

I nflammatory pseudotumor is a benign growth, with a pathological profile consisting of a proliferation of connective tissue associated with an inflammatory infiltrate of mononuclear elements. It has been reported to occur most often in systemic locations. 2, 16, 29 Primary central nervous system (CNS) involvement is rare and confined to the sellar and parasellar regions 14 and choroid plexus. 4 We report a case of a pseudotumor arising from the choroid plexus of the lateral ventricles; a previous inflammatory process of this structure is also discussed

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Gavin W. Britz, D. Kyle Kim, and John D. Loeser

D iffuse villous hypertrophy of the choroid plexus, as described by Davis 2 in 1924, has often been erroneously referred to as bilateral choroid plexus papillomas. A papilloma by definition implies a discrete mass; thus, it is distinct from villous hyperplasia, in which diffuse enlargement of the entire choroid plexus occurs throughout the length of the choroidal fissure, as has been documented in four previous reports. 2, 3, 9, 16 Our case clearly demonstrates diffuse enlargement of the choroid plexus throughout the ventricular system ( Fig. 1 ). In

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Hideo Terao, Shu Kobayashi, Akira Teraoka, and Riki Okeda

T he first case of xanthogranuloma of the choroid plexus in humans was recorded by Blumer 2 in 1900, although he designated it as a cholesteatomatous endothelioma. Since then, there have been several case reports and reviews of this entity. Choroid plexus xanthogranulomas are frequently encountered at postmortem examination, but they are usually asymptomatic and very few cases have been reported with surgical intervention. We are reporting an additional clinical case, with discussion of possible preoperative diagnosis in order to avoid undertaking

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Nicole Prendergast, Jeffrey D. Goldstein, and Alexandra D. Beier

C horoid plexus adenomas are a rare, benign subset of choroid plexus tumors that the 2016 World Health Organization Histological Classification of Tumours of the Central Nervous System does not separately categorize. 14 Although they occur across a broad age range, these tumors have been reported in only 4 cases in the pediatric age group. 4 , 17 As these tumors are mainly intraventricular, children usually present with hydrocephalus. Radiographically, the tumors are difficult to differentiate from the more common choroid plexus tumors; therefore