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Imaging manifestations of papillary glioneuronal tumors.
Neurosurg Rev
April 2024
Department of Radiology, Beijing Tiantan Hospital, Capital Medical University, Beijing, 100070, China.
To analyse the imaging findings of papillary glioneuronal tumors (PGNTs), in order to improve the accuracy of preoperative diagnosis of this tumor. The clinical and imaging manifestations of 36 cases of PGNT confirmed by pathology were analyzed retrospectively. A total of 17 males and 19 females, averaging 22.
View Article and Find Full Text PDFPapillary glioneuronal tumor: A rare case with recent updates as per 2021 CNS WHO 5th classification.
Indian J Pathol Microbiol
February 2024
MS Surgery, RMLIMS, Lucknow, Uttar Pradesh, India.
The papillary glioneuronal tumor is a WHO grade 1, rare neuronal-glial tumor and comprises 0.02% of all CNS tumors. Histologically, it is a mixture of glial and neuronal components showing a pseudopapillary pattern with hyalinized vessels.
View Article and Find Full Text PDFAdult cerebral high-grade glioneuronal tumor with perivascular or pseudopapillary growth co-existing with low-grade tumor: a case report.
Int J Clin Exp Pathol
October 2023
Department of Pathology, Kansai Medical University Hirakata, Japan.
An unusual, small cell-predominant, high-grade glioneuronal tumor in the occipital lobe of a 49-year-old man that co-existed with a low-grade tumor is reported. The tumor consisted of two distinct components: the major component was a dense proliferation of primitive small cells showing bidirectional neuronal and glial differentiation; and the minor component consisted of a proliferation of well-differentiated astrocytes intermingled with mature neuronal cells. In the former component, perivascular pseudorosette-like or pseudopapillary growth reminiscent of ependymoma or papillary glioneuronal tumor (PGNT), respectively, was prominent, and hypertrophic astrocytic cells were located just outside the central blood vessels.
View Article and Find Full Text PDF[Histological Classification and Diagnosis of Sellar/Parasellar Tumors].
No Shinkei Geka
September 2023
Department of Hypothalamic and Pituitary Surgery, Toranomon Hospital.
In the 5 edition of the WHO classification of pituitary tumors, there are several significant changes:(1)the nomenclature has evolved from "pituitary adenoma" to "pituitary neuroendocrine tumor"(PitNET);(2)PitNETs are now categorized in detail based on tumor lineage, cell type, and related characteristics;(3)the routine use of pituitary transcription factor()immunohistochemistry for PitNET classification;(4)there is a distinction between two types of craniopharyngioma(CP), adamantinomatous CP and papillary CP, characterized by (β-catenin)and mutations, respectively;(5)the integration of four subtypes of posterior lobe(neurohypophysial)tumors, known as the family of pituicyte tumors that express , is emphasized. Regarding tumor proliferation markers, the assessment of the Ki-67 proliferation index remains important, although no specific cutoff value was provided. Certain PitNET subtypes have been recognized as clinically more aggressive, referred to as high-risk PitNETs.
View Article and Find Full Text PDFPapillary Glioneuronal Tumor Masquerading as Malignant Brain Tumors: A Case Report.
Yonago Acta Med
August 2023
Division of Neurosurgery, Department of Brain and Neurosciences, School of Medicine, Faculty of Medicine, Tottori University, Yonago 683-8503, Japan.
Papillary glioneuronal tumor (PGNT) is a low-grade biphasic tumor that is composed of glial fibrillary acidic protein (GFAP)-positive glial cells and synaptophysin-positive neurons. We report a case of PGNT occurring in the right occipital lobe of a 48-year-old woman who presented with acute headache and left homonymous hemianopsia, the latter of which was difficult to distinguish from malignant brain tumors because of peritumoral brain edema, intratumoral hemorrhage, and intraoperative fluorescence staining. PGNT should be included as one of the differential diagnoses in cases where the tumor shows hemorrhagic change despite decreased perfusion in arterial spin labeling MRI.
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