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Lateral ventricle subependymoma resected with a transcallosal approach: illustrative case

Franco Rubino, Michael P. Catalino, Romulo A. Andrade de Almeida, and Sujit S. Prabhu

characteristics of the tumor infiltrating the ependyma over the basal ganglia or fornix and the continuous use of brain retractors to reach the lateral ventricle. 7 , 8 Conversely, the highest rates of severe postoperative complications have been reported in subependymomas located in the posterior fossa. 6 , 9 In this report, we present the case of a 65-year-old male with a subependymoma located in the left lateral ventricle. The tumor was completely resected using an interhemispheric transcallosal approach. Illustrative Case History and Presentation A 65-year

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Rare large colloid cyst obstructing the posterior third ventricle: illustrative case

Jakob V. E. Gerstl, Kristian Aquilina, and Jeffrey E. Florman

be symptomatic, as even a small mass can cause obstruction, 11 a colloid cyst arising in the roof of the posterior ventricle requires significant size to be of clinical consequence. In addition to origin and size, the direction of cyst growth is relevant and often depends on the anatomical origin of the cyst as it relates to variance in the point of forniceal column divergence from the body of the fornix. 12 Normally, this point of divergence is relatively anterior, and a classic cyst arising anteriorly in the roof of the third ventricle therefore grows

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Bilateral frontal intracranial xanthoma associated with type II hyperlipidemia in a 42-year-old woman: illustrative case

Donny Argie, Christopher Lauren, and Elric B. Malelak

heterogeneous signal intensity in the frontal lobe of both hemispheres, especially on the right side ( Fig. 1A–D ). The mass consisted primarily of a cystic component with some vascularized and necrotic area, surrounded by edema. There was no significant enhancement with intravenous contrast administration. Multiple small cystic components extended between the fornix and corpus callosum ( Fig. 1C and D ). Based on characteristics of MRI, we suspected a malignant glioma, oligodendroglioma, lymphoma, or other intraaxial lesion as the primary differential diagnoses. We performed

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Suboccipital trans-horizontal fissure approach for cerebellar hemorrhage with rupture into the upper fourth and third ventricles: the first clinical experience. Illustrative cases

Ryota Tamura, Makoto Katayama, Yuki Kuranari, and Takashi Horiguchi

penetration of the SMV, the upper fourth ventricle packed with hematoma can be directly visualized ( 3 ). Hematoma in the upper fourth ventricle is removed. Dorsal brainstem is observed ( 4 ). Hematoma in the middle fourth ventricle is removed (caudal microscope direction) ( 5 ). Aqueduct is clearly identified (cranial microscope direction) ( 6 ). The third ventricle packed with blood clot is seen through aqueduct ( 7 ). Obstructive hydrocephalus is resolved by irrigation of the hematoma in the third and fourth ventricles. Fornix, superior choroidal vein, and choroid plexus

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Use of a flow diverter in a small-caliber end artery anterior choroidal dissecting pseudoaneurysm: illustrative case

Griffin Ernst, Noor A. Mahmoud, Audrey Grossen, and Andrew Bauer

Anterior choroidal artery (AChA) aneurysms account for 3%–5% of intracranial aneurysms, with the majority arising proximally at the junction with the supraclinoid internal carotid artery (ICA). 1 , 2 Distal AChA aneurysms, those that arise from the cisternal segment of the AChA, are exceedingly rare, with only a few cases reported. 2 The AChA originates from the C7 segment of the ICA and supplies eloquent structures, including the posterior limb of the internal capsule, optic tract, basal ganglia, uncus, fimbria of the fornix, hippocampal head, amygdala

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Malignant transformation of central neurocytoma with dissemination 17 years after initial treatment: illustrative case

Kazuhiro Kojima, Yoshiki Arakawa, Yasuhide Takeuchi, Yukinori Terada, Masahiro Tanji, Yohei Mineharu, Hironori Haga, and Susumu Miyamoto

stereotactic radiosurgery has favorable local control in small lesions. 10 , 11 Recurrences of central neurocytomas are usually local. We reviewed 16 patients with central neurocytomas that recurred with dissemination ( Table 1 ). 10 , 12–24 The mean age of onset was 30.6 years (range 3–56 years). Of the 16 cases, 10 were men and 6 were women. The primary tumors arose from the subarachnoid space (n = 1), septum pellucidum (n = 3), fornix, or walls of the ventricles (lateral ventricles: n = 10; third ventricles: n = 2). The initial Ki-67 labeling index was available in 11

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The infundibulochiasmatic angle and the favorability of an endoscopic endonasal approach in type IV craniopharyngioma: illustrative case

Guilherme Finger, Maria Jose C Ruiz, Eman H Salem, Matthew D Marquardt, Kyle C Wu, Lucas P Carlstrom, Ricardo L Carrau, Luciano M Prevedello, and Daniel M Prevedello

significant experience with the EEA and work within a multidisciplinary team familiar with the anatomy of the suprasellar region and third ventricle to safely perform this approach ( Fig. 5 ). The floor of the third ventricle extends from the optic chiasm anteriorly to the sylvian aqueduct posteriorly. The anterior wall of the third ventricle is formed by the anterior column of the fornix, anterior commissure, and lamina terminalis. 6 This approach is adjacent to many important structures, including the optic chiasm, infundibulum, tuber cinereum, mammillary bodies

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First documented case of intracranial falcine malignant peripheral nerve sheath tumor: illustrative case

Renato J. Galzio, Mattia Del Maestro, Diamantoula Pagkou, Massimo Caulo, Sofia Asioli, Alberto Righi, Viscardo Paolo Fabbri, and Sabino Luzzi

-channel head coil. The patient received plain and contrast-enhanced standard MR sequences, dynamic susceptibility contrast-enhanced perfusion MRI, and multivoxel MR spectroscopy. A large, almost ovoidal (maximal diameters: sagittal, 59 mm; axial, 52 mm; and coronal, 45 mm) significantly heterogenous space-occupying lesion was observed in the right/left paramedian area posterior to the fornix just above the pineal region. The tumor developed in the right lateral ventricle, contralaterally shifting the septum pellucidum, bulging superiorly at the posterior third of the

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Diffusely invasive supratentorial rosette-forming glioneuronal tumor: illustrative case

Brittany Owusu-Adjei, Constance J Mietus, Jeewoo Chelsea Lim, William Lambert, Rrita Daci, David Cachia, Thomas W Smith, and Peter S Amenta

cerebral peduncles and midbrain. The patient initially underwent a right frontal craniotomy, septostomy, biopsy, and placement of an external ventricular drain ( Fig. 2 ). Prior to disturbing the tumor, cerebrospinal fluid (CSF) was collected for cytology. The exophytic nonenhancing right frontal horn lesion was resected in its entirety ( Fig. 2B ). The enhancing third-ventricular lesion was identified filling the right foramen of Monro and merging with the right fornix. The appearance was consistent with that of the floor of the third ventricle