RESUMEN
Genetic variation, both single-nucleotide variations and copy number variations (CNV), contribute to changes in gene expression. In some cases these variations are meaningfully correlated with disease states. We hypothesized that in a genetically heterogeneous disorder such as sporadic Alzheimer's disease (AD), utilizing gene expression as a quantitative trait and CNVs as a genetic marker map within the same individuals in the context of case-control status may increase the power to detect relevant loci. Using this approach an 8-kb deletion was identified that contains a PAX6-binding site on chr2q33.3 upstream of CREB1 encoding the cAMP responsive element-binding protein1 transcription factor. The association of the CNV to AD was confirmed by a case-control association study consisting of the Texas Alzheimer Research and Care Consortium and NIA-LOAD Family Study data sets.
Asunto(s)
Enfermedad de Alzheimer/genética , Proteína de Unión a Elemento de Respuesta al AMP Cíclico/genética , Adulto , Anciano , Anciano de 80 o más Años , Enfermedad de Alzheimer/metabolismo , Estudios de Casos y Controles , Proteína de Unión a Elemento de Respuesta al AMP Cíclico/metabolismo , Variaciones en el Número de Copia de ADN , Proteínas del Ojo/metabolismo , Femenino , Perfilación de la Expresión Génica , Predisposición Genética a la Enfermedad , Genotipo , Proteínas de Homeodominio/metabolismo , Humanos , Masculino , Persona de Mediana Edad , Factor de Transcripción PAX6 , Factores de Transcripción Paired Box/metabolismo , Proteínas Represoras/metabolismoRESUMEN
We describe the first patient with an extradural, extramedullary Ewing's sarcoma tumor mimicking a nerve sheath tumor with no overt evidence of metastasis. A 28-year-old woman with no past medical history presented with a progressive 3-year history of low back pain and right-sided lower extremity radiculopathy after having failed conservative therapies. MRI of the lumbar spine revealed a right-sided enhancing, dumbbell-shaped lesion at the right neural foramen appearing to originate from the L4 nerve root, suspicious for a peripheral nerve sheath tumor or schwannoma. The patient and findings are discussed in the context of the literature, including an update on the relatively recent diagnostic redesignation of the Ewing's sarcoma family tumors.
Asunto(s)
Neoplasias Óseas/diagnóstico , Neoplasias de la Vaina del Nervio/fisiopatología , Sarcoma de Ewing/diagnóstico , Adulto , Neoplasias Óseas/cirugía , Femenino , Humanos , Imagen por Resonancia Magnética , Sarcoma de Ewing/cirugíaRESUMEN
BACKGROUND: Rosenthal fibers (RFs) are thick, elongated, brightly eosinophilic structures occurring within astrocytic processes. Although the presence of abundant RFs within brain tumors is most closely associated with a low-grade astrocytoma, particularly pilocytic astrocytoma (PA), a few RFs are recognized to occur, although rarely, in glioblastoma (GBM). We report a very rare case of GBM with abundant RFs. CASE REPORT: A 60-year-old woman presented with a 6-month history of difficulty coordinating her right hand, occasional intermittent diplopia, and occasional dizzy spells. An MRI showed a heterogeneously enhancing, infiltrating mass lesion with a cystic component involving the left midbrain, thalamus, and posterior basal ganglia. Biopsy was performed. Cytologic touch imprints revealed fibrillary astrocytic cells possessing oval nuclei and long delicate processes with abundant RFs. Histologic sections showed diffusely infiltrating astrocytoma with prominent RFs diffusely distributed throughout the tumor, brisk mitotic activity, vascular proliferation, and small areas of necrosis, as seen in a GBM. The Ki-67 (MIB-1) labeling index was 7.1%. P53 immunoreactivity was not seen. A follow-up MRI study performed 3 months after the biopsy showed a considerable tumor progression with extension into the left superior cerebellar peduncle and progressive hydrocephalus. DISCUSSION: This is a case of RF-rich GBM (primary or de novo type). The differential diagnosis includes PA and anaplastic PA. For the histological diagnosis, infiltrating astrocytoma with abundant RFs should be carefully examined in light of clinical information (e.g., patient age, evolution of the symptoms) and neuroimaging studies.
Asunto(s)
Astrocitos/patología , Neoplasias Encefálicas/patología , Glioblastoma/patología , Neoplasias Encefálicas/metabolismo , Femenino , Glioblastoma/metabolismo , Humanos , Inmunohistoquímica , Imagen por Resonancia Magnética , Persona de Mediana EdadRESUMEN
Cyst formation is a recognized late complication after stereotactic radiosurgery for cerebral arteriovenous malformations (AVMs). We report on a patient with delayed cyst formation after combined embolization and stereotactic radiosurgery treatments for a cerebral AVM. The true nature of the cyst was complicated by tumefactive magnetic resonance MR imaging characteristics. The tumefactive cyst was associated with an additional imaging finding suggestive of a neoplastic lesion - a 'blush' on conventional angiography.
Asunto(s)
Quistes/etiología , Embolización Terapéutica/efectos adversos , Malformaciones Arteriovenosas Intracraneales/cirugía , Lóbulo Occipital/cirugía , Complicaciones Posoperatorias/etiología , Radiocirugia/efectos adversos , Adulto , Neoplasias Encefálicas/diagnóstico , Arteria Carótida Externa/diagnóstico por imagen , Arteria Carótida Externa/patología , Arteria Carótida Externa/fisiopatología , Angiografía Cerebral , Quistes/patología , Quistes/fisiopatología , Diagnóstico Diferencial , Embolización Terapéutica/métodos , Femenino , Humanos , Malformaciones Arteriovenosas Intracraneales/patología , Malformaciones Arteriovenosas Intracraneales/fisiopatología , Imagen por Resonancia Magnética , Arterias Meníngeas/diagnóstico por imagen , Arterias Meníngeas/patología , Arterias Meníngeas/fisiopatología , Neovascularización Patológica/etiología , Neovascularización Patológica/patología , Neovascularización Patológica/fisiopatología , Procedimientos Neuroquirúrgicos , Lóbulo Occipital/patología , Lóbulo Occipital/fisiopatología , Complicaciones Posoperatorias/patología , Complicaciones Posoperatorias/fisiopatología , Radiocirugia/métodos , Reoperación , Prevención Secundaria , Resultado del TratamientoRESUMEN
Three cases of cerebral phaeohyphomycosis are described. Two cases (Cases 1, 2) are caused by highly neurotropic fungi, Cladophialophora bantiana, and the other one (Case 3) is the first reported case in the United States, caused by the newly defined Fonsecaea monophora. (Case 1): A 65-year-old woman had been treated for a presumed diagnosis of Guillain-Barré syndrome and was found to have a ring-enhancing, fluid-filled lesion in the right frontal lobe. The lesion was aspirated twice and then resected completely. (Case 2): A 45-year-old woman with a history of severe dermatomyositis presented with subacute ischemia in the left brainstem. Approximately 2 months later, she developed acute obstructive hydrocephalus and was found to have small cystic lesions in the left ambient cistern, fourth ventricle and cerebral aqueduct, which had probably caused the previous ischemic symptoms due to emboli/ thrombi. (Case 3): A 62-year-old, post livertransplant woman developed multiple brain and bone abscesses. Cultures from these lesions grew the same fungi. Histologically, all three cases revealed multiple epithelioid and giant cell granulomata with groups of golden-brown yeast-like cells as well as chains of budding cells. In Case 3, scattered muriform cells, characteristic of chromoblastomycosis, were present. In Cases 2 and 3, the fungi were easily identified on frozen sections, which may be considered useful in determining post-operative therapy.
Asunto(s)
Absceso Encefálico/microbiología , Infecciones Fúngicas del Sistema Nervioso Central/microbiología , Hongos Mitospóricos , Anciano , Absceso Encefálico/diagnóstico , Absceso Encefálico/terapia , Infecciones Fúngicas del Sistema Nervioso Central/diagnóstico , Infecciones Fúngicas del Sistema Nervioso Central/terapia , Femenino , Humanos , Persona de Mediana EdadAsunto(s)
Encefalopatías/diagnóstico , Histiocitosis Sinusal/diagnóstico , Encefalopatías/patología , Encefalopatías/cirugía , Femenino , Histiocitos/patología , Histiocitosis Sinusal/patología , Histiocitosis Sinusal/cirugía , Humanos , Linfocitos/patología , Imagen por Resonancia Magnética , Persona de Mediana Edad , Células Plasmáticas/patologíaRESUMEN
Bcl-2 and bcl-xL are homologous proteins that inhibit cell death and are expressed in the nervous system. We tested the hypothesis that aberrant expression of such "death suppressor" molecules may promote the survival of abnormal cells in glioneuronal lesions associated with temporal lobe epilepsy. The normal pattern of bcl-2 and bcl-x expression was studied in postmortem human fetal and adult temporal lobes. Formalin-fixed, paraffin-embedded tissue sections were probed for bcl-2 and bcl-x in immunohistochemical studies using well-characterized primary antibodies that had been raised against epitopes that are not shared by these proteins. Strong staining for both proteins was observed in the ventricular zone and in migrating, postmitotic and postmigratory young neurons of the neocortex, hippocampus, and entorhinal cortex from 6 to 20 weeks gestational age (GA). However, bcl-2 immunoreactivity gradually decreased to weak or nondetectable levels between 20 and 39 weeks GA, while strong bcl-x staining of neurons persisted throughout fetal development and into adulthood. Twenty-eight temporal lobe resections from children and adults ranging in age from 1 to 45 years (mean=19 years) with intractable epilepsy were then screened for differences in the pattern of bcl-2 and bcl-x expression compared to normal controls. Bcl-2 (but not bcl-x) was strongly immunoreactive in small, immature-appearing cells that were components of microscopic glioneuronal aggregates (hamartias) and that have been shown previously to express an embryonic form of the neural cell adhesion molecule. These immature cells were immunonegative for standard markers of neuronal and glial lineage and were negative for Ki67, suggesting that they are post-mitotic. The persistent expression of bcl-2 and apparent downregulation of bcl-x in these cells represent deviations from the normal ontogeny of these molecules in the human nervous system. These data suggest that dysregulation of bcl-2 and related proteins may be involved in the pathogenesis of some temporal lobe malformative lesions.
Asunto(s)
Envejecimiento/metabolismo , Epilepsia del Lóbulo Temporal/metabolismo , Feto/metabolismo , Neuroglía/metabolismo , Neuronas/metabolismo , Proteínas Proto-Oncogénicas c-bcl-2/metabolismo , Proteínas Proto-Oncogénicas/metabolismo , Lóbulo Temporal/metabolismo , Adolescente , Adulto , Neoplasias Encefálicas/metabolismo , Neoplasias Encefálicas/patología , Niño , Preescolar , Desarrollo Embrionario y Fetal , Epilepsia del Lóbulo Temporal/patología , Femenino , Feto/fisiología , Humanos , Inmunohistoquímica , Lactante , Masculino , Persona de Mediana Edad , Lóbulo Temporal/citología , Proteína bcl-XRESUMEN
We report the detection of cytoplasmic immunoreactivity for neuronal/neuroendocrine antigens in a subpopulation of tumor cells within seven pleomorphic xanthoastrocytomas (PXAs). The expression of glial and neuronal polypeptides was examined in routinely prepared surgical resections by immunohistochemistry using well-characterized antibodies that recognize glial fibrillary acidic protein (GFAP), synaptophysin (SYN), and neurofilament triplet polypeptides (NFPs) in microwave-enhanced single- and double-immunolabelling experiments. Each neoplasm contained cells that were immunoreactive for SYN and/or NFPs, GFAP, and occasionally for both GFAP and either NFP or SYN. We conclude that abortive neuronal/neuroendocrine differentiation may occur in PXAs, suggesting a relationship between PXA and other developmental neoplasms that reveal a more overt neuronal phenotype, such as ganglioglioma, dysembryoplastic neuroepithelial tumor, and desmoplastic ganglioglioma, and with tumors expressing ambiguous glial/neuronal lineage, such as the subependymal giant cell tumor of tuberous sclerosis. These findings suggest that aberrant expression and accumulation of neuronal intermediate filaments may account for the large, pleomorphic cell morphology observed in many of these tumors.
Asunto(s)
Astrocitoma/patología , Neoplasias Encefálicas/patología , Adolescente , Adulto , Astrocitoma/metabolismo , Neoplasias Encefálicas/metabolismo , Niño , Preescolar , Citoplasma/metabolismo , Femenino , Proteína Ácida Fibrilar de la Glía/metabolismo , Humanos , Inmunohistoquímica/métodos , Masculino , Proteínas de Neurofilamentos/metabolismo , Coloración y Etiquetado , Sinaptofisina/metabolismoRESUMEN
A 30-week gestational age male fetus was found to have a congenital neoplasm involving the posterior cranial fossa, identified by fetal ultrasound examination in utero. Histological and immunohistochemical examination confirmed a diagnosis of primitive neuroectodermal tumor (PNET) of the posterior fossa, also referred to as medulloblastoma. Although PNETs have been well documented, there are relatively few reports of these occurring as congenital neoplasms. We present a case of an in utero, congenital PNET with a review of the literature and discussion of the criteria defining congenital tumors.