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B. K. Kleinschmidt-DeMasters, Ken R. Winston, David Rubinstein, and Mary H. Samuels

P ituitary adenomas occur only rarely in extrasellar sites that are not in continuity with the pituitary. Such sites have included the sphenoid sinus, 8 nasal cavity, 3, 10 petrous temporal bone, 10 and third ventricle. 11 Ectopic growth has been reported in patients with a separate intrasellar pituitary adenoma, suggesting that the ectopic growth arose from dissemination of a primary intrasellar tumor, either spontaneously or following surgical manipulation. 9, 10 In the very rare situation where ectopic pituitary adenomas have been identified without

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Marvin Bergsneider, John G. Frazee, and Antonio A. DeSalles

intraventricular hemorrhage of a saccular aneurysm lying within the third ventricle. Case Report This 65-year-old, right-handed man presented with a sudden onset of severe headache, a stiff neck, photophobia, and emesis. His medical history was significant for long-standing hypertension and moderate alcohol-related liver disease with resultant coagulopathy, chronic anemia, and thrombocytopenia (prothrombin time 16.2 seconds (control 12.1 seconds); hematocrit 32.2; platelet count 76,000/cu mm). He had a distant history of syphilis, but no evidence of meningovascular disease

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Thomas M. Markwalder, Regula V. Markwalder, and Hans M. Markwalder

the third ventricle are extremely rare. The latter tumors are mostly located in the posterior part of the third ventricle and present a symptomatology resembling pinealomas. 5 This paper presents a case of meningioma of the anterior part of the third ventricle. Case Report This 36-year-old woman was seen in neurosurgical consultation in December, 1973, because of amenorrhea. Six months later she presented with a marked ataxia, dysdiadochokinesia, and kinetic tremor of both hands, followed by signs of raised intracranial pressure (ICP). Examination

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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

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Fernando Gutierrez-Lara and Salomon Hakim D.

within the third ventricle. We are reporting our experience with 30 cases so treated. Operative Technique The patient is supine with his head in a neutral position on a soft circular support about 5 cm high. The retroauricular region and neck are prepared and the x-ray machine is positioned for anteroposterior and lateral projections. A 3 cm anteroposterior incision is made 13 cm from the nasion and 4 cm left of the middle line. A burr hole is centered on the coronal suture. Once the dura mater has been incised and the pia arachnoid coagulated, the ventricular

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Abdel Wahab M. Ibrahim, Hisham Farag, Mohammed Naguib, and Ezzeldin Ibrahim

C olloid cysts of the third ventricle are rare intracranial lesions. It has been estimated that they comprise approximately 0.55% of all tumors of the brain. 7, 17 Histologically they are benign but, by virtue of their position, they may produce marked dilatation of the lateral ventricles by obstructing one or both foramina of Monro. Although the first case of colloid cyst of the third ventricle was reported by Wallmann 22 in 1858, it was not until 1921 that the first successful removal of a colloid cyst was accomplished by Dandy. 5 In an analysis of his

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Yoichi Katayama, Takashi Tsubokawa, Tsuyoshi Maeda, and Takamitsu Yamamoto

C avernous malformations can occur at any location in the central nervous system, 10, 22, 25, 26, 29, 31, 35, 39 including the pineal, 32 midbrain, 27, 37 and thalamic 3, 24 regions and the chiasma and/or optic nerve region. 16 While a cavernous malformation primarily involving the third ventricle is rare, several cases have been sporadically reported. 19, 20, 38 Due to the small number of cases, however, cavernous malformations of the third ventricle have not been discussed in detail. 4, 29, 31 In order to establish adequate therapeutic approaches for

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Mark M. Souweidane, Caitlin E. Hoffman, and Theodore H. Schwartz

endoscopic third ventricular surgery. How these variants affect the surgical technique of ETV or endoscopic colloid cyst resection has hitherto not been defined. Recent experience in patients with a cystic variant of the septum pellucidum who underwent either ETV or endoscopic colloid cyst resection has afforded us the opportunity to detail the germane intraventricular anatomy and make recommendations with respect to a safe endoscopic approach into the third ventricle. Methods Patients were selected from a prospective database maintained by the first author (M

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

A pproaching lesions within the third ventricle is challenging given the deep-seated location of the area and the critical surrounding structures. Manipulating the walls of the third ventricle can cause hypothalamic dysfunction manifested as disturbances in consciousness, temperature control, respiration, and pituitary secretion. In addition, visual loss due to damage of the optic chiasm and memory loss from injury to the columns of the fornix in the walls of the third ventricle can occur. 23 The pathophysiology in the third ventricle is diverse and

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Endoscopic treatment of colloid cysts of the third ventricle

Technical note and review of the literature

M. Samy Abdou and Alan R. Cohen

C olloid cysts of the third ventricle are benign lesions comprising between 0.5% and 1% of all brain tumors. 3, 18, 22, 32 They are thin-walled, spherical cysts composed of a collagenous capsule, an underlying epithelium, and a gelatinous center of variable viscosity. The cysts are usually attached to the anterior aspect of the velum interpositum or to the choroid plexus of the third ventricle near the foramina of Monro. 28 Colloid cysts may be found incidentally at autopsy in patients who expressed no neurological complaints or, in other patients, these