1/145. Cerebral heterotopia of the temporofacial region. Case report.The authors report a case of cerebral heterotopia in the right temporofacial region of a neonate. The lesion presented as a massive cystic swelling containing cerebrospinal fluid. It produced calvarial and facial bone deformities. After the mass was excised, histological examination revealed glial tissue and choroid plexus.- - - - - - - - - - ranking = 1keywords = choroid plexus, choroid, plexus (Clic here for more details about this article) |
2/145. The Chiari II malformation: lesions discovered within the fourth ventricle.Structural lesions associated with the Chiari II malformation have been identified within the fourth ventricle in 8 patients. During the 42-month period encompassing the operations of the 7 patients treated surgically, only 9 other patients were explored without the discovery of some associated structural lesion. The patients ranged in age from 2 to 26 years. The following lesions were identified: glial or arachnoidal cysts (3 patients), glial or choroidal nodules (3 patients) and subependymoma (2 patients). These lesions were all situated in the roof of the fourth ventricle adjacent to or interspersed with the choroid plexus. Only the cystic lesions were identified by preoperative imaging. In only 1 case did the associated lesion, a 2-cm cyst, seem to contribute to the patient's clinical presentation. Structural lesions of the fourth ventricle associated with the Chiari II malformation are common in patients who are submitted to decompression. These lesions may be dysplasias of developmental origin, or they may be reactive lesions related to chronic compression and ischemia. They do not necessarily required biopsy or excision.- - - - - - - - - - ranking = 1.0670516920776keywords = choroid plexus, choroid, plexus (Clic here for more details about this article) |
3/145. Intracranial extracerebral neuroglial heterotopia: A case report and review of the literature.Heterotopic masses of neuroglial tissue are uncommon and most frequently involve extracranial midline structures. We report an unusual case of an intracranial, extracerebral neuroglial heterotopia involving the middle and anterior cranial fossae of a 5-year-old girl who presented with facial asymmetry. The lesion was composed of mature but disorganized gray and white matter admixed with surrounding soft tissues and exhibited histologic features reminiscent of cortical dysplasia. These rare lesions have been postulated to arise from a protrusion of tissue from the neuraxis through a pial defect, from abnormalities in the migration of embryonic neuroepithelial tissue, or from an accessory evagination of the neural tube inferior to the telencephalic vesicles. Regardless of the underlying pathogenic mechanism, these lesions must be histologically distinguished from both teratomas and primary central nervous system neoplasms.- - - - - - - - - - ranking = 9.054058773096E-5keywords = neoplasm (Clic here for more details about this article) |
4/145. Intracranial papillary endothelial hyperplasia: occurrence of a case after surgery and radiosurgery.Papillary endothelial hyperplasia (PEH) is considered a form of endothelial proliferation rather than a true neoplasm and is usually located in the skin or subcutis. We report a case of intracranial PEH that occurred after surgery for glioma and subsequent radiosurgery. CT and MR revealed an enhancing extra-axial mass located left posterolateral to the brainstem. Intracranial PEH is rare; to our knowledge, development of an intracranial PEH after surgery and radiosurgery has not been previously reported.- - - - - - - - - - ranking = 9.054058773096E-5keywords = neoplasm (Clic here for more details about this article) |
5/145. Histiocytic lesion mimicking intrinsic brainstem neoplasm. Case report.This 10-year-old girl presented with a 1-month history of progressive bulbar palsy and a solitary enhancing mass originating within the floor of the fourth ventricle. Results of initial imaging studies and presentation were suggestive of neoplasia. Subtotal resection was performed and pathological examination revealed the mass to be a histiocytic lesion, with no evidence of a glioma. The patient had no other stigmata of histiocytosis and was treated with steroid medications, resulting in prolonged resolution of the lesion. This case demonstrates that for discrete brainstem lesions the differential diagnosis includes entities other than glioma for which treatment is available. biopsy sampling should be considered when technically feasible.- - - - - - - - - - ranking = 0.00036216235092384keywords = neoplasm (Clic here for more details about this article) |
6/145. Meningioangiomatosis: a case report and review of the literature.A case of cerebral meningioangiomatosis in an adult man without any stigmata of neurofibromatosis is reported. A 22 year-old man with no previous neurological history, presented with adversive seizures; clinical examination and electro-encephalogram were normal. CT showed nodular calcified masses in the left frontal lobe and in the left posterior parietal area. A craniotomy was performed and the frontal lesion was excised. Histological examination showed a predominantly intracerebral tumour involving both grey and white matter, with a complex picture of variable cellularity, dense calcification and prominent perivascular arrangements of reticulin-rich spindle cell fascicles with palisade formation widely involving the brain tissue. immunohistochemistry for S100 protein varied between different parts of the tumour; there was focal positivity for S100 protein and smooth muscle actin in the lesion with no reaction for GFAP or EMA. Immunostaining for Factor 8-related antigen highlighted the perivascular arrangement of lesional cells and demonstrated an increase in the number of small vessels in other areas. Electron microscopy of the main mass showed elongated spindle cells with formation of pericellular basal lamina. The literature on meningioangiomatosis was reviewed. The evidence for meningeal, perivascular neural plexus or pericyte origin does not appear to be well founded. The present case further illustrates the difficulty in identifying an exact histogenetic cell and probably reflects an origin from a primitive perivascular mesenchymal cell.- - - - - - - - - - ranking = 0.014793776886302keywords = plexus (Clic here for more details about this article) |
7/145. Pleomorphic xanthoastrocytoma derived from glioneuronal malformation in a child with intractable epilepsy.Malformative lesions as well as neoplasms can cause intractable epilepsy in childhood. Even though the neoplastic nature of a lesion is evident in most cases, the distinction can be difficult in some patients. We present the case of a child with intractable epilepsy caused primarily by a glioneuronal malformation. Years after the first surgical intervention, a pleomorphic xanthoastrocytoma evolved from remnants of this lesion. This case suggests that glioneuronal malformations might be precursor lesions of pleomorphic xanthoastrocytomas.- - - - - - - - - - ranking = 9.054058773096E-5keywords = neoplasm (Clic here for more details about this article) |
8/145. Ectopic choroid plexus within a juvenile arachnoid cyst of the cerebellopontine angle: cause of cyst formation or reason of cyst growth.The unusual and rare case of a 6-year-old boy is reported who presented with an arachnoid cyst located in the cerebellopontine angle incorporating an ectopic piece of choroid plexus tissue. A microneurosurgical cyst wall resection was performed and the plexus tissue identified and removed. The rare occurrence of ectopic choroid plexus tissue within cysts of the CNS is discussed.- - - - - - - - - - ranking = 6.0147937768863keywords = choroid plexus, choroid, plexus (Clic here for more details about this article) |
9/145. The medial posterior choroidal artery as an indicator of masses at the foramen of Monro.The angiographic findings in five cases of tumors at the foramen of Monro are presented. Characteristic changes in the course and configuration of the medial posterior choroidal artery are described.- - - - - - - - - - ranking = 0.33525846038789keywords = choroid (Clic here for more details about this article) |
10/145. Symptomatic bilateral xanthogranulomas of choroid plexus in a child.choroid plexus xanthogranulomas are uncommon lesions that occur almost exclusively in adults; most of them constitute incidental autopsy findings. A case of symptomatic bilateral xanthogranulomas of choroid plexus in a 6 year-old girl with progressive visual loss is reported. Theories on the pathogenesis of this entity are reviewed.- - - - - - - - - - ranking = 5.0147937768863keywords = choroid plexus, choroid, plexus (Clic here for more details about this article) |
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