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Arti Gupta, Surya Prakash Rao Nadimpalli and Robert P. Cavallino

cysticercosis, however, a cyst located in the anterior third ventricle was hyperintense on T 1 - and T 2 -weighted MR images, thereby mimicking a typical colloid cyst. Case Report Examination This 24-year-old, previously healthy man was referred to our emergency room from another institution after experiencing severe headache, nausea, vomiting, and altered sensorium. A CSF sample contained high protein levels, and the white cell count was indicative of infection. An MR image of the brain demonstrated a 7-mm lesion in the anterior third ventricle. This lesion was

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Servet Inci, Nidal Al-Rousan, Figen Söylemezoglu and Özdemir Gurçay

T he occurrence of a colloid cyst was first reported by Wallmann in 1858 (cited in an article by Ciric and Zivin 4 ). This rare lesion accounts for only 0.2 to 2% of intracranial neoplasms, 19 and its most common location is the anterosuperior portion of the third ventricle. It is occasionally observed in the lateral ventricle, 26 septum pellucidum, 4 fourth ventricle, 14, 23 and cerebellum. 19, 27 To the best of our knowledge, this is the first report of an intrapontomesencephalic colloid cyst. Despite developments in microsurgical procedures, lesions

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Adolf Müller, Andreas Büttner and Serge Weis

C olloid cysts are rare lesions, accounting for 0.2 to 2% of all intracranial neoplasms. 10, 23, 31 They are slow-growing benign tumors, the majority of which are located in the third ventricle. Other locations include the leptomeninges, 6, 7 the posterior fossa, 8 and the fourth ventricle. 30, 32 In the present report we describe the clinicopathological features of a case of intracerebellar colloid cyst. Case Report History In 1997, this 45-year-old woman was admitted to our hospital showing signs of increased intracranial pressure. Three weeks prior to

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Venkata R. Challa and William R. Markesbery

histogenesis. As originally suggested by Mosberg and Blackwood, 12 a paramedian location is evidence against an origin from the choroid plexus; this is further supported by the absence of connections to the choroid plexus in our case. This cyst was definitely not of paraphyseal origin because the situation of a true paraphyseal cyst is in the midline, anteriorly, and under the fornices, and also cilia are not present in a cyst of paraphyseal origin. 1 Recently, Ghatak, et al., 4 presented electron microscopic evidence in support of the view that colloid cysts of the

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Yoji Tamura, Teppei Uesugi, Adam Tucker, Tohru Ukita, Masao Tsuji, Hiroji Miyake and Toshihiko Kuroiwa

C olloid cysts of the third ventricle are benign tumors and a well-known cause of sudden death due to acute obstructive hydrocephalus. 6 , 13 , 18 , 21 , 26 In general, colloid cysts expand due to secretion of an amorphous and protein-rich fluid resulting in obstruction of CSF flow at the foramen of Monro. Although hemorrhage within the cyst can lead to cyst expansion, this condition is extremely rare. To the best of the authors' knowledge, there have been only 9 cases of hemorrhagic colloid cysts reported in the English literature. 3 , 5 , 7 , 8 , 10

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Neurosurgical Forum: Letters to the Editor To The Editor Dwight Parkinson , M.D. University of Manitoba Winnipeg, Manitoba, Canada 1249 1250 Abstract Object. Patients harboring colloid cysts of the third ventricle can present with acute neurological deterioration, or the first indication of the lesion may appear when the patient suddenly dies. The risk of such an occurrence in a patient already identified as harboring a colloid cyst is unknown. The goal of this study was to estimate the risk of acute

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Douglas Kondziolka and Juan M. Bilbao

C ontinuing debate surrounds the ontogenesis of intracranial colloid cysts. The original name given these structures at the end of the 19th century was based on a description of their contents, colloid meaning “resembling glue.” Bailey 3 demonstrated the existence of the paraphysis in humans, an embryonal neuroectodermal structure previously described in lower vertebrates. Its constant presence in the roof of the anterior third ventricle in the developing embryo was correlated with the seemingly constant finding of colloid cysts in this same area. For 50

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Jacques J. Lara-Reyna, Rafael Uribe-Cardenas, Imali Perera, Nicholas Szerlip, Anastasios Giamouriadis, Nicole Savage, Therese Haussner and Mark M. Souweidane

R ecent clinical experience has established that the purely endoscopic removal of colloid cysts is a valid and advantageous surgical approach. Benefits associated with endoscopic removal have been reported for length of stay, operating times, and perioperative complications. 3 , 10 , 12 The features and outcomes associated with endoscopic treatment are derived from reports of patients being treated for a newly diagnosed or primary colloid cyst. Whether the same therapeutic benefit of endoscopic surgery can be extrapolated to patients who present with cyst

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Ivan Ciric and Israel Zivin

E ver since the first report on a colloid cyst by Wallmann in 1858 19 and the first successful removal of this lesion by Dandy in 1922 3 the diagnosis and surgical treatment of colloid cysts have received wide attention in the literature. 1, 4, 9–11, 20 Perhaps even greater interest has been shown in the still somewhat uncertain pathogenesis of this lesion. 2, 5, 7, 8, 12, 13, 15, 16, 21–23, The purpose of this paper is to summarize two cases of colloid cysts that presented above the third ventricle and to explain the origin of these cysts in light of the

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Surgical resection of third ventricle colloid cysts

Preliminary results comparing transcallosal microsurgery with endoscopy

Adam I. Lewis, Kerry R. Crone, Jamal Taha, Harry R. van Loveren, Hwa-Shain Yeh and John M. Tew Jr.

C olloid cysts are benign intraventricular tumors that arise primarily from the roof of the third ventricle and may produce sudden death due to acute obstruction of cerebrospinal fluid (CSF) pathways. Most patients present with headaches due to raised intracranial pressure and hydrocephalus. Associated symptoms include short-term memory loss, nausea and vomiting, blurred vision, emotional lability, and gait disturbances. Present management options for colloid cysts include observation, shunting of CSF, stereotactic cyst aspiration, transcortical