Atypical teratoid rhabdoid tumor pathophysiology: Difference between revisions
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==Mircoscopic Pathology== | ==Mircoscopic Pathology== | ||
*On microscopic histopathological analysis, atypical teratoid rhabdoid tumor is characterized by | *On microscopic histopathological analysis, atypical teratoid rhabdoid tumor is characterized by round blue tumor cells of high cellularity composed of atypical cells with eccentric nuclei, small nucleoli, and abundant amounts of eosinophilic cytoplasm with frequent mitotic figures<ref name="SlavcChocholous2014">{{cite journal|last1=Slavc|first1=Irene|last2=Chocholous|first2=Monika|last3=Leiss|first3=Ulrike|last4=Haberler|first4=Christine|last5=Peyrl|first5=Andreas|last6=Azizi|first6=Amedeo A.|last7=Dieckmann|first7=Karin|last8=Woehrer|first8=Adelheid|last9=Peters|first9=Christina|last10=Widhalm|first10=Georg|last11=Dorfer|first11=Christian|last12=Czech|first12=Thomas|title=Atypical teratoid rhabdoid tumor: improved long-term survival with an intensive multimodal therapy and delayed radiotherapy. The Medical University of Vienna Experience 1992-2012|journal=Cancer Medicine|volume=3|issue=1|year=2014|pages=91–100|issn=20457634|doi=10.1002/cam4.161}}</ref> | ||
*According to the ''WHO classification of tumors of the central nervous system'', atypical teratoid rhabdoid tumor is classified into a WHO grade IV tumor. | *According to the ''WHO classification of tumors of the central nervous system'', atypical teratoid rhabdoid tumor is classified into a WHO grade IV tumor. | ||
Revision as of 18:59, 17 December 2015
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]Associate Editor(s)-in-Chief: Sujit Routray, M.D. [2]
Overview
Pathogenesis
- Atypical teratoid rhabdoid tumor is a primitive neuroectodermal tumor (PNET). The tumor cells are derived from the neuroectoderm, but have not developed and differentiated in the way a normal neuron would, and so the cells appear "primitive".
- Atypical teratoid rhabdoid tumor was until relatively recently classed as medulloblastoma, although both are clinically and histologically different.
Genetics
- Gene involved in the pathogenesis of atypical teratoid rhomboid tumor include SMARCB1 (hSNF5/INI-1), a tumor suppressor gene.[1]
- Atypical teratoid rhabdoid tumor is characterized by loss of the long arm of chromosome 22, which results in loss of the hSNF5/INI-1 gene.
- INI1, a member of the SWI/SNF chromatin remodeling complex, is important in maintenance of the mitotic spindle and cell cycle control.
Associated Conditions
- Atypical teratoid rhabdoid tumor may be associated with rhabdoid predisposition syndrome.[2]
Gross Pathology
- On gross pathology, atypical teratoid rhabdoid tumor is characterized by an encapsulated, grayish, friable mass which is moderately vascular.[3]
- Common intracranial sites associated with atypical teratoid rhabdoid tumor include:[4]
| Infratentorial | Supratentorial |
|---|---|
Mircoscopic Pathology
- On microscopic histopathological analysis, atypical teratoid rhabdoid tumor is characterized by round blue tumor cells of high cellularity composed of atypical cells with eccentric nuclei, small nucleoli, and abundant amounts of eosinophilic cytoplasm with frequent mitotic figures[2]
- According to the WHO classification of tumors of the central nervous system, atypical teratoid rhabdoid tumor is classified into a WHO grade IV tumor.
Immunohistochemistry
- Atypical teratoid rhabdoid tumor is demonstrated by positivity to tumor markers such as:[5][6]
- Epithelial membrane antigen
- Vimentin
- Smooth muscle actin
- GFAP
- Cytokeratin
- Neurofilament
- Desmin
References
- ↑ Ginn, Kevin F.; Gajjar, Amar (2012). "Atypical Teratoid Rhabdoid Tumor: Current Therapy and Future Directions". Frontiers in Oncology. 2. doi:10.3389/fonc.2012.00114. ISSN 2234-943X.
- ↑ 2.0 2.1 Slavc, Irene; Chocholous, Monika; Leiss, Ulrike; Haberler, Christine; Peyrl, Andreas; Azizi, Amedeo A.; Dieckmann, Karin; Woehrer, Adelheid; Peters, Christina; Widhalm, Georg; Dorfer, Christian; Czech, Thomas (2014). "Atypical teratoid rhabdoid tumor: improved long-term survival with an intensive multimodal therapy and delayed radiotherapy. The Medical University of Vienna Experience 1992-2012". Cancer Medicine. 3 (1): 91–100. doi:10.1002/cam4.161. ISSN 2045-7634.
- ↑ Chan KH, Mohammed Haspani MS, Tan YC, Kassim F (2011). "A case report of atypical teratoid/rhabdoid tumour in a 9-year-old girl". Malays J Med Sci. 18 (3): 82–6. PMC 3216225. PMID 22135607.
- ↑ Location of Atypical teratoid/rhabdoid tumour. Dr Bruno Di Muzio and A.Prof Frank Gaillard et al. Radiopaedia 2015. http://radiopaedia.org/articles/atypical-teratoidrhabdoid-tumour. Accessed on December 14, 2015
- ↑ Markers of Atypical teratoid/rhabdoid tumour. Dr Bruno Di Muzio and A.Prof Frank Gaillard et al. Radiopaedia 2015. http://radiopaedia.org/articles/atypical-teratoidrhabdoid-tumour. Accessed on December 14, 2015
- ↑ Meyers SP, Khademian ZP, Biegel JA, Chuang SH, Korones DN, Zimmerman RA (2006). "Primary intracranial atypical teratoid/rhabdoid tumors of infancy and childhood: MRI features and patient outcomes". AJNR Am J Neuroradiol. 27 (5): 962–71. PMID 16687525.