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Endoscopic posterior interhemispheric complete corpus callosotomy

Sandeep Sood, Eishi Asano, Deniz Altinok, and Aimee Luat

parietooccipital region, so that the rostrum of the corpus callosum could be accessed over the curve of the fornix, as shown in Fig. 1 ( arrow B ). After appropriate surgical prepping and draping, an incision was made approximately 3 cm in length and approximately 1–1.5 cm lateral to the midline ( Fig. 2B and C ). A D-shaped craniotomy was made with the base situated medially. The dura mater was opened with the flap based medially. Intravenous mannitol (20%, 1 g/kg body weight) was used to relax the brain in both patients. In addition, in 1 patient, a ventricular catheter was

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Combined transconjunctival–eyebrow approach providing minimally invasive access to all orbital quadrants

Technical note

Andrei Koerbel, Veralucia R. Ferreira, and André Kiss

initiated by making an incision at the canthal angle and following in the canthal skin crease ( Fig. 1 ). After canthotomy, the connections of the lateral canthal tendon to the orbital septum and periorbita are released. 16 The eyelids are spread apart and the inferior fornix is exposed. Beginning laterally, the conjunctiva is incised in the inferior fornix and extended medially ( Fig. 2 ). The lower lid is divided into preseptal, septal, and postseptal regions. 6 The preseptal region includes skin, subcutaneous tissue, orbicularis oculi muscle and suborbicularis fascia

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Transparent endoscopic sheath and rigid-rod endoscope used in endoscopic third ventriculostomy for hydrocephalus in the presence of deformed ventricular anatomy

Nakamasa Hayashi, Hideo Hamada, Kimiko Umemura, Kunikazu Kurosaki, Masanori Kurimoto, and Shunro Endo

of the third ventricle. F ig . 5 Case 6. Photographs obtained during an endoscopic procedure. Upper Left: Agenesis of the septum. Bilateral rudimentary foramina of Monro are visible (arrows) . The asterisk indicates the fornix. Upper Right: The floor of the third ventricle after opening of the foramen of Monro on the left side by the transparent sheath. Lower Left: Fenestration at the floor of the third ventricle. Lower Right: The foramen of Monro after removal of the transparent sheath. A small spotted contusion was identified. This 4-year

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Adjustment of the endoscopic third ventriculostomy entry point based on the anatomical relationship between coronal and sagittal sutures

Laboratory investigation

Fangxiang Chen, Tsinsue Chen, and Peter Nakaji

of the third ventricle and access the interpeduncular cistern. 22 , 23 An optimal trajectory for the ETV is crucial to minimize complications because the endoscope must traverse the foramen of Monro, placing the fornix and anterior thalamus at risk for injury. While image guidance and multiplanar reformatting are sometimes available for this procedure, in most of the world, including some first-world environments, empirical landmarks are used. Preoperatively, this trajectory is most often estimated on MR images in relation to the coronal suture. Typically, on a

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Retraction: Anatomy of the subthalamic nucleus, with correlation of deep brain stimulation

Akın Akakın

radiata is labeled as the internal capsule. Figure 4C incorrectly shows the primary motor cortex as anterior to the premotor area. In Figure 4D the structure labeled as the habenular commissure is the fasciculus retroflexus. The structure labeled as the fornix is the stria medullaris thalami. Figure legends are not exempt from errors themselves. Some examples of this include the following: Figure 2 is stated to be a medial view, but it is actually an inferior view. In addition, the legend states, “The thalamus is located posterolateral to the substantia nigra

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Neuroepithelial (colloid) cysts of the septum pellucidum

Ivan Ciric and Israel Zivin

resulting in the formation of the velum interpositum (b and c). Fig. 5. Drawings illustrating formation of the choroidal fissure and plexus (a) and of the corpus callosum, septum pellucidum and fornix ( arrows ) (b). The lateral walls of the diencephalon and the opposing wall of the hemispheres thicken to form the thalamus and corpus striatum respectively (b). (Modified from Truex and Carpenter, 1969, reference 18.) A similar process of invagination of the fibrovascular stroma from the vela interpositi into the diencephalic vesicle leads to the

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Spontaneous lateral ventriculocisternostomy documented by metrizamide CT ventriculography

Case report

Ashwani Kapila and Thomas P. Naidich

space. The body of the fornix (F) lies anterior to the contrast track. Metrizamide caps the tumor at the small right foramen of Monro (white arrow) , but does not enter the third or left lateral ventricles. D, E, and F: Sections through the bodies of the ventricles. The splenium (arrowheads) is outlined by intraventricular and cisternal contrast material and lies posterosuperior to the contrast track. There is no extravasation of metrizamide along the shunt tube (arrow) . The patient showed no alteration in clinical status as a result of the ventricular

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Feasibility of extended transforaminal approach (medial subchoroid) for resection of a benign aqueductal tumor in a patient with type 1 neurofibromatosis

Jose M. Narro-Donate, Jose J. Guil-Ibañez, Maria José Castelló-Ruiz, Fernando García-Pérez, Gaizka Urreta-Juarez, and José Masegosa-González

ventriculostomy by guiding the endoscope to the anterior part of the floor of the third ventricle. Mammillary bodies and premammillary membrane are identified. With the bipolar tool, we perforate the membrane and then use a 4-Fr Fogarty to dilate the perforation. Once completed, the endoscope is introduced to confirm the correct perforation of the Liliequist membrane. The basilar artery is identified with no significant surgical complications. 5:57 Damage Verification. When the endoscope is removed, the absence of lesions on the fornix is confirmed. 6 The medial

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Combined endoscopic transforaminal-transchoroidal approach for the treatment of third ventricle colloid cysts

Technical note

Maurizio Iacoangeli, Lucia Giovanna Maria di Somma, Alessandro Di Rienzo, Lorenzo Alvaro, Davide Nasi, and Massimo Scerrati

. F ig . 1. Intraoperative images. A and B: Colloid cyst (CC) protruding from the foramen of Monro (FM) and extending to the middle/posterior portion of the third ventricle. C and D: Mobilization of the choroid plexus (CP) and opening of the choroidal fissure to completely expose the attachment of the colloid cyst to the posterior roof of the third ventricle. F = fornix. However, in 5 of our 19 cases, the colloid cyst was firmly adherent to the tela choroidea or attached to the middle/posterior roof of the third ventricle, making the transforaminal route

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Contralateral anterior interhemispheric-transcallosal-transrostral approach to the subcallosal region: a novel surgical technique

Feres Chaddad-Neto, Marcos Devanir Silva da Costa, Baran Bozkurt, Hugo Leonardo Doria-Netto, Daniel de Araujo Paz, Ricardo da Silva Centeno, Andrew W. Grande, Sergio Cavalheiro, Kaan Yağmurlu, Robert F. Spetzler, and Mark C. Preul

rostrum of the corpus callosum is made longitudinally by starting 1.5 cm anterior to the foramen of Monro and the column of the fornix to avoid damage to both the fornix and the anterior commissure . The opening of the rostrum of the corpus callosum exposes the contralateral subcallosal region on the lesion side, the ACA, and the anterior communicating artery (ACoA) and its branches ( Fig. 2 ). FIG. 2. Anatomical dissection. A: Medial view shows the trajectory ( yellow dashed line ) of the anterior interhemispheric-transcallosal-transrostral approach to the