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Pathology and genetics of meningiomas.
MedLine Citation:
PMID:  22195409     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
This article constitutes a mini-review of the pathology and genetics of meningiomas. Meningiomas are the most common primary intracranial tumors. They are usually durally based and are often found adjacent to venous sinuses and dural infoldings. The majority of these tumors are WHO grade I, although a minority is WHO grade II, atypical, or WHO grade III, anaplastic. Grade II and III meningiomas show a greater tendency than Grade I tumors to recur and metastasize. The current WHO scheme recognizes 15 histologic subtypes of meningiomas. Nine of these are WHO grade I, three are grade II, and three are grade III. In addition to these histologic subtypes, meningiomas can also be graded on the basis of mitotic activity, evidence of brain invasion, growth pattern cellular density, nuclear atypia, and necrosis. Loss of the long arm of chromosome 22, which is usually associated with inactivation of the NF2 gene, is the most common genetic abnormality found in meningiomas. Other chromosomal abnormalities associated with tumorogenesis and increased gradeof meningiomas include loss of heterozygosity for chromosome 1p, loss of 14q, deletion of 9p21, abnormalities of chromosome 10 and 17q. Telomerase activity increases with meningiomas grade as well. The only proven environmental risk factor for meningiomas is ionizing radiation. Radiation-induced meningiomas are more often multiple and have higher recurrence rates than standard meningiomas.
Authors:
Hussein Alahmadi; Sidney E Croul
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Seminars in diagnostic pathology     Volume:  28     ISSN:  0740-2570     ISO Abbreviation:  Semin Diagn Pathol     Publication Date:  2011 Nov 
Date Detail:
Created Date:  2011-12-26     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8502262     Medline TA:  Semin Diagn Pathol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  314-24     Citation Subset:  IM    
Affiliation:
Department of Surgery, Division of Neurosurgery, University of Toronto, Toronto Western Hospital, Toronto, Ontario, Canada.
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