title: Pediatric embryonal tumor of the cerebellum with rhabdoid cells and novel intracytoplasmic inclusions: distinction from atypical teratoid/rhabdoid tumor.
abstract: We report a case of embryonal tumor with novel inclusion bodies occurring in the cerebellum of a 12-year-old girl. The tumor was histopathologically composed of small undifferentiated cells intermingled with a small number of rhabdoid cells, which had an ultrastructural feature of intermediate filament whorls. Immunohistochemically, the neoplasm showed a polyphenotype, including glial fibrillary acidic protein (GFAP), S-100, synaptophysin, chromogranin A, cytokeratin, vimentin, smooth muscle actin, and desmin. However, epithelial membrane antigen (EMA) immunoreactivity was absent. The MIB-1 labeling index was high (25.6%). Ultrastructurally, there was no evidence of neuronal or myogenic differentiation. The small neoplastic cells contained numerous small intracytoplasmic inclusions stained pink by eosin and red by Masson's trichrome stain. The inclusion body was a densely packed, granulovesicular structure at the electron microscopic level, and was immunoreactive for vimentin, GFAP, desmin, and actin. Reverse transcription-PCR and immunohistochemistry showed the expression of INI1 at the RNA and protein levels, respectively. In conclusion, this tumor was differentiated from atypical teratoid/rhabdoid tumor by the absence of EMA and the presence of INI1 mRNA and protein, and diagnosed as an unclassified, embryonal tumor. Eosinophilic, granulovesicular inclusions of the tumor cells are novel cytoplasmic inclusions in the brain tumor.
authors.affiliation: Department of Human Pathology, Gunma University Graduate School of Medicine, Maebashi, Japan. achie@med.gunma-u.ac.jp
authors.forename: Atsushi
authors.initials: A
authors.lastname: Sasaki
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Kurihara
authors.forename: Shogo
authors.initials: S
authors.lastname: Ishiuchi
authors.forename: Junko
authors.initials: J
authors.lastname: Hirato
authors.forename: Nobuhito
authors.initials: N
authors.lastname: Saito
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Nakazato
mesh_terms: D014408:Biomarkers, Tumor / Q000032:analysis; D002528:Cerebellar Neoplasms / Q000235:genetics / Q000378:metabolism / Q000473:pathology*; D002648:Child; D002868:Chromosomal Proteins, Non-Histone; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D002479:Inclusion Bodies / Q000473:pathology / Q000648:ultrastructure*; D008279:Magnetic Resonance Imaging; D046529:Microscopy, Electron, Transmission; D018396:Mucin-1 / Q000378:metabolism; D009364:Neoplasm Recurrence, Local / Q000378:metabolism / Q000473:pathology; D009373:Neoplasms, Germ Cell and Embryonal / Q000235:genetics / Q000378:metabolism / Q000473:pathology*; D012333:RNA, Messenger / Q000032:analysis; D020133:Reverse Transcriptase Polymerase Chain Reaction; D018335:Rhabdoid Tumor / Q000473:pathology; D000071796:SMARCB1 Protein; D013724:Teratoma / Q000473:pathology; D014157:Transcription Factors
chemical_list: D014408:Biomarkers, Tumor; D002868:Chromosomal Proteins, Non-Histone; D004268:DNA-Binding Proteins; D018396:Mucin-1; D012333:RNA, Messenger; D000071796:SMARCB1 Protein; C513266:SMARCB1 protein, human; D014157:Transcription Factors