Difference between revisions of "Neuropathology tumours"

Jump to navigation Jump to search

Neuropathology tumours (view source)

Revision as of 02:56, 22 January 2014

3,932 bytes removed ,  02:56, 22 January 2014
→‎Oligodendroglioma: split-out
Line 430: Line 430:


==Oligodendroglioma==
==Oligodendroglioma==
===General===
{{Main|Oligodendroglioma}}
*Do ''not'' arise from oligodendrocytes.
**Arise from ''glial precursor cells''.
 
Usual location:
*Fourth ventricle.
*Intramedullary spinal cord.
 
Prognosis by flavours (average survival):<ref name=Ref_PSNP98>{{Ref PSNP|98}}</ref>
*WHO grade II: 10-15 years.
*WHO grade III: 3-5 years.
 
===Microscopic===
Features:
*Highly cellular lesion composed of:
**Cells resembling ''fried eggs'' (oligodendrocytes) with:
***Round nucleus - '''key feature'''.
***Distinct cell borders.
***Moderate-to-marked nuclear atypia.
***Clear cytoplasm - useful feature (if present).
****Some oligodendrogliomas have eosinophilic cytoplasm with focal perinuclear clearing.
**Acutely branched capillary sized vessels - "chicken-wire" like appearance.
***Abundant, delicate appearing; may vaguely resemble a paraganglioma at low power.
*Calcifications - important feature.<ref>URL: [http://www.emedicine.com/radio/topic481.htm http://www.emedicine.com/radio/topic481.htm].</ref>
 
Note:
*Tumour cells may be plasmacytoid, i.e. have a [[plasma cell]]-like appearance.<ref name=pmid17284109>{{Cite journal  | last1 = Aldape | first1 = K. | last2 = Burger | first2 = PC. | last3 = Perry | first3 = A. | title = Clinicopathologic aspects of 1p/19q loss and the diagnosis of oligodendroglioma. | journal = Arch Pathol Lab Med | volume = 131 | issue = 2 | pages = 242-51 | month = Feb | year = 2007 | doi = 10.1043/1543-2165(2007)131[242:CAOQLA]2.0.CO;2 | PMID = 17284109 | URL = http://www.archivesofpathology.org/doi/full/10.1043/1543-2165(2007)131%5B242:CAOQLA%5D2.0.CO;2 }}</ref>
 
DDx:
*[[Neurocytoma]] also have perinuclear clearing and well-defined cellular borders.
**Pineocytomatous/neurocytic rosettes = (irregular) rosette with a large meshwork of fibers (neuropil) at the centre.
 
Notes:
*Few neural tumours have round nuclei - DDx:
**[[Oligodendroglioma]].
**[[Lymphoma]].
**Clear cell variant of [[ependymoma]].
**[[Germ cell tumour]] (germinoma/dysgerminoma/seminoma).
 
Images:
*[[WC]]:
**[http://commons.wikimedia.org/wiki/File:Oligodendroglioma1_high_mag.jpg Oligodendroglioma high mag. (WC)].
**[http://commons.wikimedia.org/wiki/File:Oligodendroglioma1_low_mag.jpg Oligodendroglioma low mag. (WC)].
*www:
**[http://path.upmc.edu/cases/case713.html Oligodendroglioma - several images (upmc.edu)].
**[http://frontalcortex.com/?page=oll&topic=24&qid=864 Oligodendroglioma with plasmacytoid cells (frontalcortex.com)].
 
====Histologic grading====
Come in two flavours:
# WHO grade II.
#*This is most oligodendrogliomas.
# WHO grade III.
#*Features for calling high grade:<ref name=Ref_PSNP98>{{Ref PSNP|98}}</ref>
#**Endothelial hypertrophy.
#***Plump/large endothelial cells.
#**Necrosis.
#**High mitotic rate (6 mitoses/10 HPF for whatever "HPF" means, see [[HPFitis]]).
 
===IHC===
Features:
*MAP-2 +ve.<reF name=pmid12025943>{{cite journal |author=Suzuki SO, Kitai R, Llena J, Lee SC, Goldman JE, Shafit-Zagardo B |title=MAP-2e, a novel MAP-2 isoform, is expressed in gliomas and delineates tumor architecture and patterns of infiltration |journal=J. Neuropathol. Exp. Neurol. |volume=61 |issue=5 |pages=403–12 |year=2002 |month=May |pmid=12025943 |doi= |url=}}</ref>
*GFAP -ve.
**Some subtypes +ve - should not be used to distinguish.<ref name=Ref_PSNP>{{Ref PSNP|98}}</ref>
*EMA +ve.
*IDH-1 -ve. (???).
*p53 -ve.
**Useful for differentiating ''astrocytoma'' vs. ''oligodendroglioma''.
*Ki-67.
 
===Molecular pathology===
Losses of 1p and 19q both helps with diagnosis and is prognostic:<ref name=pmid18565359>{{cite journal |author=Fontaine D, Vandenbos F, Lebrun C, Paquis V, Frenay M |title=[Diagnostic and prognostic values of 1p and 19q deletions in adult gliomas: critical review of the literature and implications in daily clinical practice] |language=French |journal=Rev. Neurol. (Paris) |volume=164 |issue=6-7 |pages=595–604 |year=2008 |pmid=18565359 |doi=10.1016/j.neurol.2008.04.002 |url=}}</ref>
*Greater chemosensitivity
*Better prognosis.


==Oligoastrocytoma==
==Oligoastrocytoma==
Michael
48,830

edits

Retrieved from "https://librepathology.org/wiki/Special:MobileDiff/28241"

Navigation menu