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    ABSTRACT: Introducción: El astrocitoma pilomixoide (APM) es un tumor del sistema nervioso central (SNC) con características clínicas y anatomopatológicas propias que lo convierten en una entidad diferente del astrocitoma pilocítico (AP). Este tumor aparece en la clasificación de tumores del SNC de la OMS en su cuarta edición (año 2007) como subtipo de AP dentro del grupo de los tumores de origen astrocitario. Actualmente sigue siendo una entidad tumoral poco conocida, existiendo controversia sobre su origen histológico y su comportamiento clínico, y una falta de consenso en cuanto a su manejo terapéutico. Objetivo: Revisar la literatura científica relacionada con el tema y presentar tres casos valorados en nuestro servicio. Conclusiones: El APM es una entidad anatomopatológica relacionada con el AP aunque con una mayor tendencia a la recidiva y diseminación por el líquido cefalorraquídeo, por lo que se recomienda seguimiento estricto y tratamiento oncológico adyuvante.
    Full-text · Article · Jan 2010 · Neurocirugia (Asturias, Spain)
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    ABSTRACT: Pilomyxoid astrocytoma (PMA) is a central nervous system (CNS) tumour with peculiar clinicopathological features, that turn it into an entity different from pilocytic astrocytoma (PA). It appears in 2007 WHO classification of tumours of the CNS as an PA subtype belonging to the group of astrocytic tumours. Nowadays little is still known about this tumour entity; the histological origin and clinical behavior remain controversial, and there is no consensus about its management. To review the scientific literature related to the topic and to present three cases treated at our service. PMA is an histological entity related to PA with a greater trend to regrowth and cerebrospinal fluid dissemination, therefore strict follow-up and oncological treatment is recommended.
    Full-text · Article · Feb 2010 · Neurocirugia (Asturias, Spain)
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    ABSTRACT: An adult male Australian parakeet (Melopsittacus undulatus) presented a firm nodular lesion in the lateral metacarpal region of the right wing. Microscopically, there were neoplastic cells, round and polyhedral in shape, with abundant, slightly eosinophilic granular cytoplasm; they were strongly periodic-acid Schiff-positive and resistant to diastase digestion. Some groups of neoplastic cells were immunopositive for smooth muscle actin and desmin. There was no immunopositivity for S-100 protein, CD68 and cytokeratin. Ultrastructurally, the neoplastic cells were round and polygonal in shape, and they were characterized by abundant cytoplasm with numerous homogeneous osmophilic bodies covered by an electron-dense membrane (lysosomes). The histopathologic, immunohistochemical and ultrastructural features of the neoplastic tissue are consistent with a granular cell tumour, which has been described in different animal species and anatomic locations; however, this seems to be an infrequent neoplasm in Australian parakeets. The immunopositivity of the neoplastic cells for smooth muscle actin and desmin, as well as slight positivity for muscle with Masson's trichrome, suggest that this is a tumour of myogenic origin.
    Full-text · Article · Aug 2012 · Avian Pathology
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