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Papillary ependymoma: its differential diagnosis from choroid plexus papilloma
Journal of Korean Medical Science ; : 415-421, 1996.
Article Dans Anglais | WPRIM | ID: wpr-83324
ABSTRACT
Papillary ependymoma is a rare variant of ependymoma and often gives rise to confusion with choroid plexus papilloma because of topographic, light microscopic and ultrastructural similarities. Here, we report two cases of papillary ependymomas regarding their unique clinicopathologic features and differential points from choroid plexus papilloma. Brain MRI revealed a large mass in the left lateral ventricle in one case and a 3cm sized mass in the pineal area and the 3rd ventricle in the other. Microscopically, the tumor was characterized by papillary and tubular structures. Immunohistochemically, the tumor cells in both cases expressed cytokeratins(CK22 and CAM 5.2) but did not express glial fibrillary acidic protein(GFAP), vimentin, epithelial membrane antigen, and S100 protein. This is a very unusual immunohistochemical feature for papillary ependymoma. Ultrastructurally, the tumor showed a mosaic pattern of tumor cells with frequent intercellular microrosettes having a few stubby microvilli, a few cilia and zonulae adherentes. The cytoplasmic processes were markedly reduced compared to conventional ependymoma. The cytoplasm did not contain intermediate filaments. Interestingly, the mitochondria showed abnormal features with a pleomorphic shape and abnormal cristae in both cases. These ultrastructural features enabled differentiation between papillary ependymoma and choroid plexus papilloma in addition to the light microscopic findings.
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Texte intégral: Disponible Indice: WPRIM (Pacifique occidental) Sujet Principal: Imagerie par résonance magnétique / Carcinome papillaire / Études de suivi / Issue fatale / Diagnostic différentiel / Épendymome / Gliome / Adulte d'âge moyen Type d'étude: Etude diagnostique / Étude observationnelle / Étude pronostique Limites du sujet: Adulte / Femelle / Humains langue: Anglais Texte intégral: Journal of Korean Medical Science Année: 1996 Type: Article

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Texte intégral: Disponible Indice: WPRIM (Pacifique occidental) Sujet Principal: Imagerie par résonance magnétique / Carcinome papillaire / Études de suivi / Issue fatale / Diagnostic différentiel / Épendymome / Gliome / Adulte d'âge moyen Type d'étude: Etude diagnostique / Étude observationnelle / Étude pronostique Limites du sujet: Adulte / Femelle / Humains langue: Anglais Texte intégral: Journal of Korean Medical Science Année: 1996 Type: Article