Rosenthal fibers producing a granular cell appearance in a glioblastoma.
In this report we describe a glioblastoma multiforme with focal granular cell change. In most astroglial tumors with granular cells, the granular appearance is due to the presence of periodic acid-Schiff-positive, membrane-bound cellular debris. In the present case the granular appearance was due to the presence of many small Rosenthal fibers, which were immunoreactive for glial fibrillary acidic protein, vimentin, ubiquitin, and heat-shock protein 27, but not for alpha-B crystallin. The ultrastructural characteristics are described. These findings demonstrate that granulofilamentous inclusions with the appearance of Rosenthal fibers in glial tumors are a structurally heterogeneous feature.
Division of Neuropathology, Toronto Hospital, University of Toronto, Canada.
M R
MR
Del Bigio
J H
JH
Deck
D001932:Brain Neoplasms / Q000473:pathology* / Q000648:ultrastructure; D003594:Cytoplasmic Granules / Q000648:ultrastructure*; D005909:Glioblastoma / Q000473:pathology* / Q000648:ultrastructure; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008854:Microscopy, Electron; D008875:Middle Aged; D009412:Nerve Fibers / Q000648:ultrastructure*; D009419:Nerve Tissue Proteins / Q000276:immunology
D009419:Nerve Tissue Proteins