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#redirect [[Neuropathology_tumours#Primitive_neuroectodermal_tumour]]
{{ Infobox diagnosis
| Name      = {{PAGENAME}}
| Image      = PNET_Histopathology_HE_200x.jpg
| Width      =
| Caption    = CNS primitive neuroectodermal tumour [[H&E stain]].
| Synonyms  = CNS-PNET
| Micro      =
| Subtypes  =
| LMDDx      = [[small round blue cell tumours]]
| Stains    =
| IHC        = S-100 +ve, Syn +/-ve
| EM        =
| Molecular  =
| IF        =
| Gross      =
| Grossing  =
| Site      = brain, spinal cord
| Assdx      =
| Syndromes  =
| Clinicalhx =
| Signs      =
| Symptoms  =
| Prevalence = rare - typically in young adults
| Bloodwork  =
| Rads      =
| Endoscopy  =
| Prognosis  = poor (WHO Grade IV)
| Other      =
| ClinDDx    =
| Tx        =
}}
 
''' CNS Primitive neuroectodermal tumour''', abbreviated '''CNS-PNET''', is an abandoned [[neuropathology tumour]] description within in the group of embryonal tumours.
The terminology was introduced in 1973 <ref>{{Cite journal  | last1 = Hart | first1 = MN. | last2 = Earle | first2 = KM. | title = Primitive neuroectodermal tumors of the brain in children. | journal = Cancer | volume = 32 | issue = 4 | pages = 890-7 | month = Oct | year = 1973 | doi =  | PMID = 4751919 }}</ref> and used in the WHO 2007 classification of CNS tumors. Since 2016 this category has been replaced by the designation '''other CNS embryonal tumors'''.
 
==General==
*Should '''not''' be confused with ''peripheral primitive neuroectodermal tumour'' (abbreviated ''[[pPNET]]''<ref name=PST14feb11>PST. 14 February 2011.</ref>), [[AKA]] ''[[Ewing sarcoma]]''.
*The former category contained a heterogenous group of poorly differentiated WHO grade IV tumours associated with following ICD-O codes:
**9473/3 CNS-PNET, NOS.
**9500/3 CNS neuroblastoma.
**9490/3 CNS ganglioneuroblastoma.
**9501/3 Medulloepithelioma.
**9392/3 Ependymoblastoma.
*Mainly children and adolescents.
*Cerebral hemisphere, brain stem or spinal cord.
*Cerebrospinal dissemination found in up to 1/3 patients.<ref name="pmid1030655">{{Cite journal  | last1 = Horten | first1 = BC. | last2 = Rubinstein | first2 = LJ. | title = Primary cerebral neuroblastoma. A clinicopathological study of 35 cases. | journal = Brain | volume = 99 | issue = 4 | pages = 735-56 | month = Dec | year = 1976 | doi =  | PMID = 1030655 }}</ref>
 
* Very poor prognosis<ref name="pmid26304823">{{Cite journal  | last1 = Tulla | first1 = M. | last2 = Berthold | first2 = F. | last3 = Graf | first3 = N. | last4 = Rutkowski | first4 = S. | last5 = von Schweinitz | first5 = D. | last6 = Spix | first6 = C. | last7 = Kaatsch | first7 = P. | title = Incidence, Trends, and Survival of Children With Embryonal Tumors. | journal = Pediatrics | volume = 136 | issue = 3 | pages = e623-32 | month = Sep | year = 2015 | doi = 10.1542/peds.2015-0224 | PMID = 26304823 }}</ref>
 
==Microscopic==
Features:
*[[Small round blue cell tumour]].
** Focal differentation into astrocytic, neuronal or ependymal phenotypes possible.
*May have true rosettes (slit-like/oval).
*Growth in streams or palisades possible ("spongioneuroblastoma").
*Vascular endothelial proliferations.
*Fibrillary background in tumours with advanced neuronal maturation (ganglioneuroblastomas).
*Variable mitotic activity.
 
===Supratentorial PNET===
* This category of small round- and blue cell tumor was used in the WHO 2007 CNS tumor classification to separate them from medulloblastomas.
* Tumors are today classified as [[AT/RT]], [[Pineoblastoma]], [[ETMR]], H3F3A-mutated [[glioblastoma]] or CNS embryonal tumor, NOS.
 
===CNS neuroblastoma===
* Since WHO 2016 CNS classification this is now a subgroup of [[Other CNS embryonal tumours]].
* Many CNS neuroblastoma / CNS ganglioneuroblastoma cluster molecularly into a group designated as CNS NB-FOXR2.<ref>{{Cite journal  | last1 = Sturm | first1 = D. | last2 = Orr | first2 = BA. | last3 = Toprak | first3 = UH. | last4 = Hovestadt | first4 = V. | last5 = Jones | first5 = DTW. | last6 = Capper | first6 = D. | last7 = Sill | first7 = M. | last8 = Buchhalter | first8 = I. | last9 = Northcott | first9 = PA. | title = New Brain Tumor Entities Emerge from Molecular Classification of CNS-PNETs. | journal = Cell | volume = 164 | issue = 5 | pages = 1060-1072 | month = Feb | year = 2016 | doi = 10.1016/j.cell.2016.01.015 | PMID = 26919435 }}</ref>
*Usu Olig-2 +ve.
*Synaptophysin +ve.
 
===CNS ganglioneuroblastoma===
* This is now a subgroup of [[Other CNS embryonal tumours]].
 
===Lipomatous medulloblastoma===
* These tumors are now designated as [[Cerebellar liponeurocytoma]].
 
===Melanotic medulloblastoma===
* In WHO CNS 1997 still a distinct tumor.
* These tumors are now considered a variant of [[medulloblastoma]].
 
===Medullomyoblastoma===
* Embryonal tumor with primitive neuronal cells and striated muscle component.
* First description in 1933.<ref>{{Cite journal  | last1 = Brody | first1 = BS. | last2 = German | first2 = WJ. | title = Medulloblastoma of the Cerebellum: A Report of 15 Cases. | journal = Yale J Biol Med | volume = 6 | issue = 1 | pages = 19-29 | month = Oct | year = 1933 | doi =  | PMID = 21433586 }}</ref>
* Since WHO 2007 CNS tumor classification tumors were classified as ''medulloblastoma with myogenic differentiation''.
 
===Medulloepithelioma===
*Neuroepithelial tumor cells arranged papillary, tubular or trabecular.
*Pseudostratified with PAS-positive membrane.
*Medulloepithelioma are grouped with ependymoblastomas and [[ETANTR]] into embryonal tumors with multilayered rosettes ([[ETMR]]).<ref name="pmid26438544">{{Cite journal  | last1 = Horwitz | first1 = M. | last2 = Dufour | first2 = C. | last3 = Leblond | first3 = P. | last4 = Bourdeaut | first4 = F. | last5 = Faure-Conter | first5 = C. | last6 = Bertozzi | first6 = AI. | last7 = Delisle | first7 = MB. | last8 = Palenzuela | first8 = G. | last9 = Jouvet | first9 = A. | title = Embryonal tumors with multilayered rosettes in children: the SFCE experience. | journal = Childs Nerv Syst | volume =  | issue =  | pages =  | month = Oct | year = 2015 | doi = 10.1007/s00381-015-2920-2 | PMID = 26438544 }}</ref>
*'''Not''' the same tumour as the intraocular medulloepithelioma.<ref name="pmid26183384">{{Cite journal  | last1 = Korshunov | first1 = A. | last2 = Jakobiec | first2 = FA. | last3 = Eberhart | first3 = CG. | last4 = Hovestadt | first4 = V. | last5 = Capper | first5 = D. | last6 = Jones | first6 = DT. | last7 = Sturm | first7 = D. | last8 = Stagner | first8 = AM. | last9 = Edward | first9 = DP. | title = Comparative integrated molecular analysis of intraocular medulloepitheliomas and central nervous system embryonal tumors with multilayered rosettes confirms that they are distinct nosologic entities. | journal = Neuropathology | volume =  | issue =  | pages =  | month = Jul | year = 2015 | doi = 10.1111/neup.12227 | PMID = 26183384 }}</ref>
 
<gallery>
File:Medulloepithelioma_Histology.jpg | Medulloepithelioma/ETMR ([[H&E]])
File:Ependymoblastoma_ETMRjpg.jpg | Medulloepithelioma/ETMR ([[H&E]])
File:Medulloepitheliom_high.jpg  | Medulloepithelioma/ETMR ([[H&E]]) 
</gallery>
 
===Ependymoblastoma===
*Often supratentorial, well circumscribed.
*Multilayered ("ependymoblastous") rosettes.
*High mitotic and proliferative activity
*Ependymoblastoma are grouped with medulloepithelioma and [[ETANTR]] into embryonal tumors with multilayered rosettes ([[ETMR]]).<ref name="pmid26438544">{{Cite journal  | last1 = Horwitz | first1 = M. | last2 = Dufour | first2 = C. | last3 = Leblond | first3 = P. | last4 = Bourdeaut | first4 = F. | last5 = Faure-Conter | first5 = C. | last6 = Bertozzi | first6 = AI. | last7 = Delisle | first7 = MB. | last8 = Palenzuela | first8 = G. | last9 = Jouvet | first9 = A. | title = Embryonal tumors with multilayered rosettes in children: the SFCE experience. | journal = Childs Nerv Syst | volume =  | issue =  | pages =  | month = Oct | year = 2015 | doi = 10.1007/s00381-015-2920-2 | PMID = 26438544 }}</ref>
 
<gallery>
File:Ependymoblastoma.jpg | Ependymoblastoma. (WC/AFIP)
File:Ependymoblastomatous_Rosette.jpg | Ependymoblastous rosettes.
File:MIB1_ependymoblastoma.jpg | MIB-1 in ependymoblastous rosettes.
</gallery>
 
==Immunohistochemistry==
* S-100 +ve.
* [[INI1]] +ve (loss defines tumour as [[ATRT]]).
* [[LIN28]]+ve (in [[ETMR]]), otherwise -ve. <ref>{{Cite journal  | last1 = Korshunov | first1 = A. | last2 = Ryzhova | first2 = M. | last3 = Jones | first3 = DT. | last4 = Northcott | first4 = PA. | last5 = van Sluis | first5 = P. | last6 = Volckmann | first6 = R. | last7 = Koster | first7 = J. | last8 = Versteeg | first8 = R. | last9 = Cowdrey | first9 = C. | title = LIN28A immunoreactivity is a potent diagnostic marker of embryonal tumor with multilayered rosettes (ETMR). | journal = Acta Neuropathol | volume = 124 | issue = 6 | pages = 875-81 | month = Dec | year = 2012 | doi = 10.1007/s00401-012-1068-3 | PMID = 23161096 }}</ref>
* Nestin +ve
* [[MAP2]] +ve/-ve
* Vimentin +ve
* [[IDH-1]] -ve
* No [[ATRX]] loss
* MIB-1 between 20-80% (usu. 50%)
 
==Molecular genetics==
Divergent molecular subgroups are emerging:
* Loss of 9q / CDKN2A deletions in CNS neuroblastoma<ref>{{Cite journal  | last1 = Pfister | first1 = S. | last2 = Remke | first2 = M. | last3 = Toedt | first3 = G. | last4 = Werft | first4 = W. | last5 = Benner | first5 = A. | last6 = Mendrzyk | first6 = F. | last7 = Wittmann | first7 = A. | last8 = Devens | first8 = F. | last9 = von Hoff | first9 = K. | title = Supratentorial primitive neuroectodermal tumors of the central nervous system frequently harbor deletions of the CDKN2A locus and other genomic aberrations distinct from medulloblastomas. | journal = Genes Chromosomes Cancer | volume = 46 | issue = 9 | pages = 839-51 | month = Sep | year = 2007 | doi = 10.1002/gcc.20471 | PMID = 17592618 }}</ref>
*Amplification 19q13.42 in [[ETMR]]<ref>{{Cite journal  | last1 = Korshunov | first1 = A. | last2 = Remke | first2 = M. | last3 = Gessi | first3 = M. | last4 = Ryzhova | first4 = M. | last5 = Hielscher | first5 = T. | last6 = Witt | first6 = H. | last7 = Tobias | first7 = V. | last8 = Buccoliero | first8 = AM. | last9 = Sardi | first9 = I. | title = Focal genomic amplification at 19q13.42 comprises a powerful diagnostic marker for embryonal tumors with ependymoblastic rosettes. | journal = Acta Neuropathol | volume = 120 | issue = 2 | pages = 253-60 | month = Aug | year = 2010 | doi = 10.1007/s00401-010-0688-8 | PMID = 20407781 }}</ref>
 
 
DDx:
* Small round blue cell tumours
* [[Medulloblastoma]]
* [[ATRT]] (INI1 loss)
* Anaplastic [[ependymoma]] (RELA fusions)
* Paediatric [[glioblastoma]] (IDH1/2) and (H3F3A mutations)
*[[Embryonal tumour with abundant neuropil and true rosettes]] (ETANTR) - currently no distinct WHO entity.<ref name=pmid19563506>{{cite journal |author=Buccoliero AM, Castiglione F, Degl'Innocenti DR, ''et al.'' |title=Embryonal tumor with abundant neuropil and true rosettes: morphological, immunohistochemical, ultrastructural and molecular study of a case showing features of medulloepithelioma and areas of mesenchymal and epithelial differentiation |journal=Neuropathology |volume=30 |issue=1 |pages=84–91 |year=2010 |month=February |pmid=19563506 |doi=10.1111/j.1440-1789.2009.01040.x |url=}}</ref>
 
===Images===
www:
*[http://path.upmc.edu/cases/case414.html Primitive neuroectodermal tumour - several images (upmc.edu)].
*[http://path.upmc.edu/cases/case649.html GBM with PNET component - several images (upmc.edu)].
 
==See also==
*[[Neuropathology tumours]].
 
==References==
{{Reflist|2}}
 
[[Category:Neuropathology tumours]]
[[Category:Embryonal tumour]]
[[Category:WHO Grade IV tumour]]
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