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1.
Arq. neuropsiquiatr ; 62(4): 1100-1103, dez. 2004. ilus
Article in Portuguese | LILACS | ID: lil-390686

ABSTRACT

Homem de 37 anos, branco, tabagista, foi internado com tosse seca e dor no hemitórax esquerdo (HE). Ao exame, macicez e murmúrio vesicular diminuído no terço médio do HE. A tomografia axial computadorizada de tórax revelou lesão expansiva nodular do 7º arco costal, projetando-se para o interior do HE, com densidade de parte mole e discreto realce pelo contraste. A histologia e a imuno-histoquímica foram compatíveis com schwannoma benigno. Consideramos que o diagnóstico de schwannoma benigno intercostal deve ser aventado ante toda massa intratorácica posterior ou lateral que curse com escassa sintomatologia e ausência de manifestações clínicas de malignidade.


Subject(s)
Adult , Humans , Male , Intercostal Nerves , Lung Neoplasms/diagnosis , Neurilemmoma/diagnosis , Peripheral Nervous System Neoplasms/diagnosis , Diagnosis, Differential , Immunohistochemistry , Neurilemmoma/ultrastructure , Peripheral Nervous System Neoplasms/ultrastructure , Tomography, X-Ray Computed
2.
Rev. mex. oftalmol ; 74(4): 141-56, jul.-ago. 2000. ilus, tab, CD-ROM
Article in Spanish | LILACS | ID: lil-295006

ABSTRACT

Los tumores del sistema periférico en oftalmología son poco frecuentes y algunos excepcionales. Los derivados de las simpaticogonias o neuroblastos constituyen el espectro de los neuroblastomas, ganglioneuroblastomas y ganglioneuromas; los derivados de los troncos nerviosos son los neurofibromas, schwannomas y neuromas. Los paragangliomas y quimiodectomas son excepcionales y el tumor de tritón es una verdadera rareza. Algunas de estas neoplasias se encuentran formando parte de síndromes complejos con clara connotación heredofamiliar. Se realiza una revisión clinicopatológica cuidadosa de estas entidades.


Subject(s)
Eye/pathology , Neoplasms , APUD Cells , Peripheral Nervous System/pathology , Paraganglioma , Ganglioneuroblastoma/ultrastructure , Neurilemmoma/ultrastructure , Neuroblastoma/ultrastructure , Neurofibroma , Neuroma/ultrastructure
3.
Indian J Cancer ; 1991 Mar; 28(1): 1-8
Article in English | IMSEAR | ID: sea-49668

ABSTRACT

This report deals with the ultrastructural observations of 30 peripheral nerve sheath tumours [PNST], which include 25 schwannomas of acoustic nerve, one schwannoma of cauda equina, one neurofibroma from a case of Von Recklinghausen's disease, one pigmented neurofibroma of spinal nerve root and a malignant schwannoma of frontal region. Interdigitating slender cytoplasmic processes covered with a continuous layer of basal lamina constitute the single most important ultrastructural attribute of Schwann cells. Myelin formation was encountered in the cell processes of four out of 25 acoustic schwannomas. In four cases Microtubular arrays identical to that in an axon were seen in Schwann cells. These two observations require further support by additional cases of PNST studies by electron microscopy. The neurofibroma consisted only of Schwann cells and no ultrastructurally identifiable perineurial cells or fibroblasts were detected. The cells in the pigmented neurofibroma revealed submicroscopic features of both Schwann cell and melanocyte, indicating their common ancestry. A unique case of malignant schwannoma arising from frontal meninges is illustrated and it is emphasized that electron microscopy is mandatory for a correct histogenetic diagnosis of malignant tumours which occur at unexpected anatomical sites.


Subject(s)
Adult , Child , Humans , Male , Melanoma/ultrastructure , Microtubules/ultrastructure , Neurilemmoma/ultrastructure , Neurofibroma/ultrastructure , Neuroma, Acoustic/ultrastructure , Peripheral Nervous System Neoplasms/ultrastructure , Schwann Cells/ultrastructure
4.
Patología ; 28(2): 103-6, abr.-jun. 1990.
Article in Spanish | LILACS | ID: lil-102235

ABSTRACT

Se presenta un caso de schwanoma maligno con diferenciación rabdomioblástica (tumor "tritón" maligno, TTM) desarrollado en la pared costal de un niño de 4 años. La inesperada diferenciación divergente fue demostrada por inmunohistoquímica para proteína S-100, mioglobina, dismina y microscopía electrónica, ya que la histología convencional no había permitido su reconocimiento. La revisió de la literatura reunió otros 8 casos en niños, con gran dispersión en la edad y localización, pero en general con un pronótico desfavorable .


Subject(s)
Child, Preschool , Humans , Male , Cell Differentiation , Immunohistochemistry , Neoplasms, Nerve Tissue , Neurilemmoma/mortality , Neurilemmoma/pathology , Neurilemmoma/ultrastructure , Rhabdomyoma
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