1/49. choroid plexus papilloma diagnosed by crush cytology.In a 32-yr-old man, an infratentorial cystic lesion with a mural nodule was interpreted to be either a hemangioblastoma or a cystic astrocytoma on CT scan. Intraoperative crush cytology revealed it to be a choroid plexus papilloma (CPP). The utility of crush cytology in the rapid diagnosis of central nervous system (CNS) tumors and the differential diagnosis of CNS papillary lesions are highlighted in this report.- - - - - - - - - - ranking = 1keywords = plexus (Clic here for more details about this article) |
2/49. Papillary craniopharyngioma of the third ventricle--case report.A papillary craniopharyngioma localized in the third ventricle occurred in a 45-year-old male. The clinical presentation was unusual and the neuroradiological appearance resembled a choroid plexus papilloma of the third ventricle. The tumor originated from the right anterolateral wall of the third ventricle, forming a discrete mass with prominent papillae formation. The tumor was totally removed by a transcallosal approach without neurological or endocrinological sequelae.- - - - - - - - - - ranking = 0.2keywords = plexus (Clic here for more details about this article) |
3/49. Primary choroid plexus papilloma located in the suprasellar region: case report.A 34-year-old woman with primary choroid plexus papilloma occurring in the suprasellar region is reported. No connection with the ventricular system was found during intraoperative observations. The findings of pathological examinations such as hematoxylin and eosin staining, transthyretin (prealbumin) immunoreactivity, and electron microscopy were consistent with choroid plexus papilloma. Radiologically, it was extremely difficult to differentiate from tuberculum sellae meningioma. To our knowledge, this is the first case of primary choroid plexus papilloma in this location reported in the literature.- - - - - - - - - - ranking = 1.4keywords = plexus (Clic here for more details about this article) |
4/49. Primary choroid plexus papilloma of the cerebellopontine angle: magnetic resonance imaging, computed tomographic and angiographic appearances.The computed tomographic, angiographic and magnetic resonance imaging (MRI) appearances of a benign primary choroid plexus papilloma of the cerebellopontine angle are reported. Although benign, this tumour showed local invasion of the petrous temporal bone and mastoid air cells. The differential diagnosis of cerebellopontine angle lesions is discussed. papilloma is suggested by the presence of a vascular, calcified, enhancing extra-axial mass in or around the cerebellopontine angle. MRI may show evidence of high vascularity and internal haemorrhage. Differentiation from other cerebellopontine tumours, most particularly meningioma, may not be possible on radiological features.- - - - - - - - - - ranking = 1keywords = plexus (Clic here for more details about this article) |
5/49. choroid plexus tumor in a child.A 5-month-old infant is reported who presented with fever, nonspecific symptoms, a rapidly enlarging head, and a regression in motor development. Investigations subsequently confirmed the diagnosis of a choroid plexus papilloma.- - - - - - - - - - ranking = 1keywords = plexus (Clic here for more details about this article) |
6/49. down syndrome complicated by brain tumors: case report and review of the literature.This report concerns a 24-year-old male patient with down syndrome, complicated by a benign but true neoplastic lesion of a differentiated papilloma of the choroid plexus which simultaneously displayed a dysgenetic character. A review of the literature revealed a lack of single case reports of down syndrome with brain tumors, which may reflect chance occurrence; however, the brain tumors in down syndrome patients are characterized by their dysontogenetic or dysgenetic character.- - - - - - - - - - ranking = 0.2keywords = plexus (Clic here for more details about this article) |
7/49. cauda equina tumor with ependymal and paraganglionic differentiation.We describe the case of a 31-year-old woman who was first treated for a pigmented choroid plexus papilloma of the fourth ventricle. Ten year later, she developed a new tumor in the region of the cauda equina. This second neoplasm contained areas of papillary ependymoma that displayed phosphotungstic acid hematoxylin-positive glial fibers and immunoreactivity for glial fibrillary acidic and S-100 proteins. Areas of ependymoma merged with others that displayed the appearance of a paraganglioma, including lobules and nests of chief cells immunoreactive for neuron-specific enolase, synaptophysin, chromogranin, and serotonin. Satellite cells, but not chief cells, stained for glial fibrillary acidic and S-100 proteins. Electron microscopy showed features of both ependymal and paraganglionic differentiation, including intercellular lumina with microvilli, junctional complexes, cell processes with closely packed filaments, and dense core granules. Our case represents a rare example of a cauda equina neoplasm with simultaneous ependymal and paraganglionic differentiation. To our knowledge, this is the first described example of a tumor of this region showing features of both ependymoma and paraganglioma.- - - - - - - - - - ranking = 0.2keywords = plexus (Clic here for more details about this article) |
8/49. Microsurgical and magnetic resonance imaging anatomy of the cerebello-medullary fissure and its application during fourth ventricle surgery.The cerebellomedullary fissure, the only entrance or exit to the fourth ventricle, is surrounded rostrally by the cerebellar tonsils and the biventral lobules and caudally by the medulla oblongata, the tela choroidea, and the lateral recesses. This fissure is an important route in operations on the fourth ventricle. We studied the microsurgical and magnetic resonance imaging (MRI) anatomy of the fissure by using autopsied normal cerebellum. MRI revealed that the fissure is visible as a slit and is indicated by the enhanced choroid plexus and the flocculus. Oriented by the anatomical information thus obtained, we have surgically treated nine patients with a tumor either in or around the fourth ventricle. Preoperative MRI clearly demonstrated the tumors in relation to the cerebellomedullary fissure. It revealed the precise anatomical location and extension of the tumor, not only its inferior extension but also its lateral one. The MRI findings and microsurgical anatomy of the cerebellomedullary fissure were quite useful for the removal of the tumors in the fourth ventricle.- - - - - - - - - - ranking = 0.2keywords = plexus (Clic here for more details about this article) |
9/49. Histological and immunocytochemical findings in a case of fetal choroid plexus papilloma.Reported in this paper is a case of a fetus delivered in the 24th week of pregnancy whose intracranial space was found to be almost totally filled up by a choroid plexus papilloma. Co-expression of vimentin and cytokeratin 8, 18 of the epithelium was immunocytochemically observed, as had been also described in normal fetal choroid plexus.- - - - - - - - - - ranking = 1.2keywords = plexus (Clic here for more details about this article) |
10/49. Malignant choroid plexus papilloma of the IV ventricle.We report a case of malignant choroid plexus papilloma (MCPP) of the IV ventricle in a child with prominent extraventricular expansive growth, mostly into the cerebellopontine angle. Interestingly enough, the tumor was entirely covered by thin, smooth, membranous, fibrous tissue, probably derived from the pia mater. In addition, hydrocephalus was not observed. The reason for the lack of hydrocephalus remains speculative, but it is possible that the presence of pure, nonexpansive, fibrous covering on the tumor might have suppressed the tumor growth to some extent, resulting in progressively increased intratumoral pressure. This, in turn, caused the suppression of excessive cerebrospinal fluid production by the tumor cells. From the diagnostic standpoint, immunohistochemical studies, using antiepithelial membrane antigen (EMA) and antitissue polypeptide antigen (TPA), were demonstrated to be useful for diagnosing the tumor.- - - - - - - - - - ranking = 1keywords = plexus (Clic here for more details about this article) |
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