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Pilocytic astrocytoma

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https://www.readbyqxmd.com/read/28079349/interleukin-13-receptor-alpha-2-as-a-marker-of-poorer-prognosis-in-high-grade-astrocytomas
#1
Masahiko Wanibuchi, Yuko Kataoka-Sasaki, Masanori Sasaki, Shinichi Oka, Yayoi Otsuka, Miki Yamaguchi, Hirofumi Ohnishi, Shunya Ohtaki, Shouhei Noshiro, Satoshi Ookawa, Takeshi Mikami, Nobuhiro Mikuni, Osamu Honmou
BACKGROUND: Interleukin-13 receptor alpha 2 (IL13Rα2) is considered a prognostic marker for gliomas according to the World Health Organization (WHO) grade. However, the expression levels of the marker vary from case to case, even within the same grade. We investigated whether IL13Rα2 could serve as a predictor of poorer prognosis in gliomas. METHODS: mRNA expression of IL13Rα2 was measured using real-time quantitative reverse transcription polymerase chain reaction (qRT-PCR) in 52 formalin-fixed paraffin-embedded glioma samples (4 pilocytic astrocytomas, 9 diffuse astrocytomas, 12 anaplastic astrocytomas, and 27 glioblastomas, grade IV)...
January 12, 2017: Journal of Neurosurgical Sciences
https://www.readbyqxmd.com/read/28039365/complete-prevalence-of-malignant-primary-brain-tumors-registry-data-in-the-united-states-compared-with-other-common-cancers-2010
#2
Adah S Zhang, Quinn T Ostrom, Carol Kruchko, Lisa Rogers, David M Peereboom, Jill S Barnholtz-Sloan
BACKGROUND: Complete prevalence proportions illustrate the burden of disease in a population. This study estimates the 2010 complete prevalence of malignant primary brain tumors overall and by Central Brain Tumor Registry of the United States (CBTRUS) histology groups, and compares the brain tumor prevalence estimates to the complete prevalence of other common cancers as determined by the Surveillance, Epidemiology, and End Results Program (SEER) by age at prevalence (2010): children (0-14 y), adolescent and young adult (AYA) (15-39 y), and adult (40+ y)...
December 29, 2016: Neuro-oncology
https://www.readbyqxmd.com/read/28028335/utility-of-squash-smear-cytology-in-intraoperative-diagnosis-of-central-nervous-system-tumors
#3
Savita S Patil, Jyoti K Kudrimoti, Rachana D Agarwal, Meenal V Jadhav, Ashish Chuge
BACKGROUND: Central nervous system (CNS) squash cytology (CSC) has established itself as a technically simple, rapid, inexpensive, fairly accurate, and dependable intraoperative diagnostic tool. It helps neurosurgeons immensely when management is dependent on it. AIMS: This study aimed at finding out the utility of CSC as an intraoperative diagnostic tool from a neurosurgeon's perspective. MATERIALS AND METHODS: Fifty prospectively registered patients with clinical diagnosis of CNS tumors were enrolled in the study...
October 2016: Journal of Cytology
https://www.readbyqxmd.com/read/28024978/pilocytic-astrocytoma-of-fornix-mimicking-a-colloid-cyst-report-of-two-cases-and-review-of-the-literature
#4
REVIEW
Guive Sharifi, Reza Rahmanzadeh, Mahmoud Lotfinia, Ramin Rahmanzade
BACKGROUND: Colloid cyst is a gelatin-containing cyst in the brain almost always found in the third ventricle. The specific shape and location of these cysts, a round well-delineated mass in the rostral part of the third ventricle adjacent to the foramen of Monro, on imaging are the main findings for diagnosis. Several masses of the third ventricle masquerading colloid cysts on images have been reported yet. Based on different surgical approach, pre-operative misdiagnosis of colloid cyst may have great impact on prognosis...
December 23, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/28009226/report-of-effective-trametinib-therapy-in-2-children-with-progressive-hypothalamic-optic-pathway-pilocytic-astrocytoma-documentation-of-volumetric-response
#5
Catherine Miller, Daniel Guillaume, Kathryn Dusenbery, H Brent Clark, Christopher Moertel
Brain tumors are the most common solid tumor in childhood, and astrocytomas account for the largest proportion of these tumors. Increasing sophistication in genetic testing has allowed for the detection of specific mutations within tumor subtypes that may represent targets for individualized tumor treatment. The mitogen-activating protein kinase (MAPK) pathway and, more specifically, BRAF mutations have been shown to be prevalent in pediatric pilocytic astrocytomas and may represent one such area to target...
December 23, 2016: Journal of Neurosurgery. Pediatrics
https://www.readbyqxmd.com/read/28002790/establishment-and-application-of-a-novel-patient-derived-kiaa1549-braf-driven-pediatric-pilocytic-astrocytoma-model-for-preclinical-drug-testing
#6
Florian Selt, Juliane Hohloch, Thomas Hielscher, Felix Sahm, David Capper, Andrey Korshunov, Diren Usta, Sebastian Brabetz, Johannes Ridinger, Jonas Ecker, Ina Oehme, Jan Gronych, Viktoria Marquardt, David Pauck, Heidi Bächli, Charles D Stiles, Andreas von Deimling, Marc Remke, Martin U Schuhmann, Stefan M Pfister, Tilman Brummer, David T W Jones, Olaf Witt, Till Milde
Pilocytic astrocytoma (PA) is the most frequent pediatric brain tumor. Activation of the MAPK pathway is well established as the oncogenic driver of the disease. It is most frequently caused by KIAA1549:BRAF fusions, and leads to oncogene induced senescence (OIS). OIS is thought to be a major reason for growth arrest of PA cells in vitro and in vivo, preventing establishment of PA cultures. Hence, valid preclinical models are currently very limited, but preclinical testing of new compounds is urgently needed...
December 17, 2016: Oncotarget
https://www.readbyqxmd.com/read/27995658/microvascular-proliferation-of-brain-metastases-mimics-glioblastomas-in-squash-cytology
#7
T Gi, Y Sato, T Tokumitsu, A Yamashita, S Moriguchi-Goto, H Takeshima, S Sato, Y Asada
OBJECTIVE: Although microvascular proliferation is a key feature in the diagnosis of high-grade glioma, the characteristics of metastatic tumour vessels in smear preparations have not been documented. In this study, the vascular changes in metastatic brain tumours, using squash cytology to examine the vascular patterns in brain metastases, were reviewed. METHODS: One hundred and forty-three squash smears of brain tissue, including 25 normal or reactive tissue, 23 malignant lymphomas, 8 grade I glioma (pilocytic astrocytoma), 23 grade II glioma (diffuse astrocytoma and oligodendroglioma), 42 grade IV glioma (glioblastoma), and 22 metastasis, were assessed...
December 19, 2016: Cytopathology: Official Journal of the British Society for Clinical Cytology
https://www.readbyqxmd.com/read/27978508/targeted-next-generation-sequencing-of-pediatric-neuro-oncology-patients-improves-diagnosis-identifies-pathogenic-germline-mutations-and-directs-targeted-therapy
#8
Cassie N Kline, Nancy M Joseph, James P Grenert, Jessica van Ziffle, Eric Talevich, Courtney Onodera, Mariam Aboian, Soonmee Cha, David R Raleigh, Steve Braunstein, Joseph Torkildson, David Samuel, Michelle Bloomer, Alejandra G de Alba Campomanes, Anuradha Banerjee, Nicholas Butowski, Corey Raffel, Tarik Tihan, Andrew W Bollen, Joanna J Phillips, W Michael Korn, Iwei Yeh, Boris C Bastian, Nalin Gupta, Sabine Mueller, Arie Perry, Theodore Nicolaides, David A Solomon
BACKGROUND: Molecular profiling is revolutionizing cancer diagnostics and leading to personalized therapeutic approaches. Herein we describe our clinical experience performing targeted sequencing for 31 pediatric neuro-oncology patients. METHODS: We sequenced 510 cancer-associated genes from tumor and peripheral blood to identify germline and somatic mutations, structural variants, and copy number changes. RESULTS: Genomic profiling was performed on 31 patients with tumors including 11 high-grade gliomas, 8 medulloblastomas, 6 low-grade gliomas, 1 embryonal tumor with multilayered rosettes, 1 pineoblastoma, 1 uveal ganglioneuroma, 1 choroid plexus carcinoma, 1 chordoma, and 1 high-grade neuroepithelial tumor...
November 14, 2016: Neuro-oncology
https://www.readbyqxmd.com/read/27936528/infratentorial-ganglioglioma-mimicking-pilocytic-astrocytoma
#9
Kirti Gupta, Madhivanan Karthigeyan, Pravin Salunke
Majority of tumors arising in posterior fossa in children are pilocytic astrocytoma. However, a small subset of these have a neuronal component that may either be admixed throughout with the glial component or may be segregated to one or two regions within the glial element. Interestingly, the radiological features of this subgroup are also distinctive, showing midline location, frequent cyst formation, hemorrhage, and circumscribed nature. Taken together, both radiological and pathological features can fairly predict the subgroup categorization within infratentorial gangliogliomas (GG), as has been recently elucidated...
December 12, 2016: Clinical Neuropathology
https://www.readbyqxmd.com/read/27927709/spontaneous-aneurysmal-subarachnoid-haemorrhage-in-a-child-with-multiply-recurrent-posterior-fossa-juvenile-pilocytic-astrocytoma
#10
Dillon Y Chen, Michael L Levy, John Ross Crawford
No abstract text is available yet for this article.
December 7, 2016: BMJ Case Reports
https://www.readbyqxmd.com/read/27921213/pediatric-intracranial-primary-anaplastic-ganglioglioma
#11
Wolf Lüdemann, Rouzbeh Banan, Christian Hartmann, Helmut Bertalanffy, Concezio Di Rocco
BACKGROUND: Primary intracranial anaplastic gangliogliomas are rare tumors in the pediatric patient group. Most of them present with symptoms of elevated pressure or symptomatic epilepsy. Extraaxial location is far more common than axial location. On MRI examination, they mimic pilocytic astrocytomas. The outcome after surgery depends mainly on the possible amount of surgical resection, and oncological therapy is necessary to prevent recurrence of the disease. CASE REPORT: An 11-year-old boy presented with headache and double vision due to obstructive hydrocephalus...
December 5, 2016: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/27920871/suprasellar-pilocytic-astrocytoma-in-an-adult-with-hemorrhage-and-leptomeningeal-dissemination-case-report-and-review-of-literature
#12
Radwa K Soliman, Caterina Budai, Pravin Mundada, Bakar Aljohani, Elisabeth J Rushing, Spyros S Kollias
Pilocytic astrocytoma (PA) is a low-grade tumor. It has an excellent prognosis after total resection. Leptomeningeal dissemination and hemorrhage are very rare to be associated with PA and lead to unfavorable prognosis. A 35-year-old man was diagnosed with a hemorrhagic suprasellar PA in 2006. Subsequent examination in 2007 revealed another large subdural hemorrhagic lesion in the sacral region, which proved to be PA by histopathologic assessment. Other leptomeningeal foci were discovered mainly at the craniocervical junction...
December 2016: Radiology case reports
https://www.readbyqxmd.com/read/27920686/single-agent-carboplatin-for-a-rare-case-of-pilomyxoid-astrocytoma-of-the-spinal-cord-in-an-adult-with-neurofibromatosis-type-1
#13
Anastasie M Dunn-Pirio, Elizabeth Howell, Roger E McLendon, Katherine B Peters
INTRODUCTION: Pilomyxoid astrocytoma (PMA) is a rare and more aggressive variant of pilocytic astrocytoma, which usually affects young children and is most often located in the hypothalamic/chiasmatic region. The association of PMA with underlying genetic disorders is not well known. METHODS: We identified a 23-year-old woman with a PMA of the spinal cord who was simultaneously diagnosed with neurofibromatosis type 1. Diagnosis of neurofibromatosis type 1 was made clinically and confirmed with genetic testing that revealed a heterozygous one-amino-acid deletion (c...
September 2016: Case Reports in Oncology
https://www.readbyqxmd.com/read/27917325/case-report-a-rosette-forming-glioneuronal-tumor-in-the-tectal-plate-in-a-patient-with-neurofibromatosis-type-i
#14
Emily P Sieg, Russell Payne, Sara Langan, Charles S Specht
We report the case of a 41-year-old female with neurofibromatosis Type 1 (NF1) who developed a rosette-forming glioneuronal tumor (RGNT) in the tectal plate. This tumor was diagnosed in 2002 when the patient presented with obstructive hydrocephalus, which was subsequently treated with a ventriculoperitoneal shunt and then an endoscopic third ventriculostomy. Initially thought to be a pilocytic astrocytoma, it was followed with serial magnetic resonance imaging (MRI) until tumor progression and development of a large fourth ventricular cystic component prompted resection via suboccipital craniotomy...
November 1, 2016: Curēus
https://www.readbyqxmd.com/read/27917302/characterization-of-the-blood-brain-barrier-in-pediatric-central-nervous-system-neoplasms
#15
Christopher S Hong, Winson Ho, Martin G Piazza, Abhik Ray-Chaudhury, Zhengping Zhuang, John D Heiss
OBJECTIVE: The normal blood-brain barrier (BBB) is composed of tight junctions between endothelial cells and surrounding astrocyte foot processes. Breakdown of the physiological astrocyte-endothelial cell relationship occurs in adult metastatic and primary brain tumors. However, the astrocyte-endothelial cell relationship has not been studied in pediatric tumors. MATERIALS AND METHODS: Utilizing specimens from cases of pilocytic astrocytoma (n = 5), medulloblastoma (n = 5), and low-grade diffuse astrocytoma (n = 1), immunofluorescence were performed using primary antibodies against CD31, glial fibrillary acidic protein (GFAP), and aquaporin 4 (AQ4)...
2016: Journal of Interdisciplinary Histopathology
https://www.readbyqxmd.com/read/27915062/rosette-forming-glioneuronal-tumor-originating-from-the-spinal-cord-report-of-2-cases-and-literature-review
#16
Lian Duan, Yunkun Zhang, Weilun Fu, Sumin Geng
Rosette-forming glioneuronal tumor (RGNT) is a recently recognized and rarely encountered tumor occurring in the fourth ventricle. RGNT was first described as a new entity for the distinct clinicopathologic features by Komori et.al. in 2002. Histologically, it is composed of 2 distinct features: a glial component, resembling pilocytic astrocytoma, and a neurocytic component forming neurocytic rosettes and/or perivascular rosettes. We report 2 extremely rare cases of RGNT arising from the spinal cord, which were misdiagnosed as ependymoma and astrocytoma preoperatively...
November 30, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/27900936/malignant-progression-of-a-histone-h3-3-k27m-mutated-spinal-pilocytic-astrocytoma-in-an-adult
#17
Stefan Reers, David Krug, Walter Stummer, Martin Hasselblatt
No abstract text is available yet for this article.
November 30, 2016: Clinical Neuropathology
https://www.readbyqxmd.com/read/27900758/99mtc-hmpao-perfusion-spect-ct-in-the-diagnosis-of-brain-death
#18
Thorsten Derlin, Desiree Weiberg
This report describes a case of brain death (BD) evaluated by 99mTc-hexamethylpropylene amine oxime (HMPAO) single photon emission tomography/computed tomography (SPECT/CT). A 16-year-old boy with a history of rapid unexpected brain herniation due to pilocytic astrocytoma underwent 99mTc-HMPAO SPECT/CT for evaluation of brain death in the context of organ donation. Flow images demonstrated lack of blood flow to the brain, and delayed images showed absence of demonstrable radionuclide activity within the brain...
2016: Nuclear Medicine Review. Central & Eastern Europe
https://www.readbyqxmd.com/read/27893178/comprehensive-genetic-characterization-of-rosette-forming-glioneuronal-tumors-independent-component-analysis-by-tissue-microdissection
#19
Yohei Kitamura, Takashi Komori, Makoto Shibuya, Kentaro Ohara, Yuko Saito, Saeko Hayashi, Aya Sasaki, Eiji Nakagawa, Ryosuke Tomio, Akiyoshi Kakita, Masashi Nakatsukasa, Kazunari Yoshida, Hikaru Sasaki
A rosette-forming glioneuronal tumor (RGNT) is a rare, mixed neuronal-glial tumor characterized by biphasic architecture of glial and neurocytic components. The number of reports of genetic analyses of RGNTs is few. Additionally, the genetic background of the unique biphasic pathological characteristics of such mixed neuronal-glial tumors remains unclear. To clarify the genetic background of RGNTs, we performed separate comprehensive genetic analyses of glial and neurocytic components of five RGNTs, by tissue microdissection...
November 28, 2016: Brain Pathology
https://www.readbyqxmd.com/read/27889018/posterior-fossa-tumors
#20
REVIEW
Lara A Brandão, Tina Young Poussaint
Pediatric brain tumors are the leading cause of death from solid tumors in childhood. The most common posterior fossa tumors in children are medulloblastoma, atypical teratoid/rhabdoid tumor, cerebellar pilocytic astrocytoma, ependymoma, and brainstem glioma. Location, and imaging findings on computed tomography (CT) and conventional MR (cMR) imaging may provide important clues to the most likely diagnosis. Moreover, information obtained from advanced MR imaging techniques increase diagnostic confidence and help distinguish between different histologic tumor types...
February 2017: Neuroimaging Clinics of North America
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