Neuropathology tumours
The article covers tumours in neuropathology. Tumours are a large part of neuropathology. Cytopathology of CNS tumours is dealt with in the article CNS cytopathology.
There are separate articles for peripheral nerve sheath tumours and pituitary/peri-pituitary lesions.
Brain tumours - overview
Adult
Four most common types of brain tumours:[1]
- Metastatic brain tumours (barely edges out primary tumours)
- Lung (most common).
- Breast.
- Melanoma.
- Renal cell carcinoma (RCC).
- Glioblastoma, AKA glioblastoma multiforme.
- Anaplastic (malignant) astrocytoma.
- Meningioma.
Children
- Astrocytoma.
- Medulloblastoma.
- Ependymoma.
Location (most common)
Certain tumours like to hang-out at certain places:[2]
- Cerebrum:
- Cortical based - oligodendroglioma.
- Grey-white junction - metastases.
- White matter - astrocytoma, glioblastoma.
- Periventricular - CNS lymphoma.
- Cystic - ganglioglioma, pilocytic astrocytoma, pleomorphic xanthoastrocytoma.
- Cerebellum:
- Midline/central - medulloblastoma.
- Cystic lesion - pilocytic astrocytoma (younger individual), hemangioblastoma (older individual).
- Solid lesion (older individual) - metastasis.
- Spinal cord:
- Ependymoma, glioblastoma.
- Filum terminale - myxopapillary ependymoma, paraganglioma.
Filum terminale
- Filum terminale = bottom end of the spinal cord - has a limited differential.
DDx:[3]
- Meningioma.
- Myxopapillary ependymoma.
- Neurofibroma.
- Schwannoma.
- Paraganglioma.
Cerebellopontine angle
DDx:[4]
- Schwannoma.
- Meningioma.
- Dermoid cyst/epidermoid cyst.
- Ependymoma.
- Choroid plexus papilloma.
Primary vs. secondary (metastatic)
Primary
Glial tumours:
- Cytoplasmic processes - key feature.
- Best seen at highest magnification - usu. ~1 micrometer.
- Processes may branch.
- Ill-defined border/blend with the surrounding brain.
- Large (lymphoid) cells, ergo usu. not a difficult diagnosis.
- ~2x size of resting lymphocyte, nucleoli.
- Lesion predominantly perivascular.
Secondary
Carcinomas:
- Well-demarcated border between brain and lesion - key feature.
- No cytoplasmic processes.
- Usu. have nuclear atypia of malignancy.
- Nuclei often ~3-4x the size of a RBC.
- +/-Glandular arrangement.
- +/-Nucleoli.
Common brain tumours in a table
| Type | Key feature(s) | Imaging | History | Notes | IHC | Images |
| Normal tissue | cells regularly spaced, no nuc. atypia | small lesion? / deep lesion? | variable | missed lesion? | nil | very high mag., high mag. |
| Reactive astrocytes | astrocytes with well-demarcated eosinophilic cytoplasm, regular spacing, no nuc. atypia | small lesion? / deep lesion? | variable | missed lesion / close to a lesion; non-specific pathologic process - need more tissue | nil | high mag. |
| Astrocytoma (grade II or worse) | glial processes (esp. on smear), nuclear atypia (size var. ~3x, irreg. nuc. membrane, hyperchromasia), no Rosenthal fibres in the core of the lesion † | often enhancing (suggests high grade), usu. supratentorial, usu. white matter | usu. old, occ. young | very common, esp. glioblastoma | IDH-1+/-, GFAP+ | high mag., very high mag. |
| Metastasis | sharp interface with brain, often glandular, +/-nucleoli, no glial processes | often cerebellular, well-circumscribed | usu. old | often suspected to have metastatic disease | TTF-1, CK7, CK20, BRST-2 | very low mag., high mag. |
| Meningioma | whorls, psammomatous calcs, nuclear inclusions | extra-axial + intradural | old or young | may be diagnosed on smear, DDx: choroid plexus, schwannoma | EMA, PR, Ki-67 | intermed. mag. |
| Schwannoma | cellular areas (Antoni A), paucicelluar areas (Antoni B), palisading of nuclei (Verocay bodies) | extra-axial + intradural | old or young | need frozen section to Dx | S100 | intermed. mag. |
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† Rosenthal fibres at the periphery of a lesion are a non-specific finding seen in chronic processes.
Metastatic tumours
General
- Most common brain tumour in adults.
Microscopic
Features:
- Vary by subtype.
Images:
Infiltrative astrocytomas
Main article: Astrocytoma
Overview
- Low-grade (diffuse) astrocytomas (Grade II).
- Anaplastic astrocytomas (Grade III).
- Glioblastoma (Grade IV).
Notes:
- Non-infiltrative gliomas:
- Pilocytic astrocytomas (WHO Grade I).
- Dysembryoplastic neuroepithelial tumour (DNT), (WHO Grade I).
Microscopic
- Glial processes - key feature.
- Thin stringy cytoplasmic processes - best seen at high power in less cellular areas.
- No Rosenthal fibres within the tumour itself.
Images:
Notes:
- Glial vs. non-glial tumours:
- Glial: "blends into brain"/gradual transition to non-tumour brain.
- Non-glial: no glial processes.
- Rosenthal fibres within the tumour... make it into a pilocytic astrocytoma.
- Rosenthal fibres may be seen around a (very) slow growing tumour and represent a reactive process.
Grading
Nuclear pleomorphism present:
- At least grade II (diffuse astrocytoma).
Mitotic figures present:
- At least grade III (anaplastic astrocytoma).
Microvascular proliferation or necrosis with pseudopalisading tumour cells:
- Grade IV (glioblastoma AKA glioblastoma multiforme).
Notes:
- Pseudopalisading tumour cells = high tumour cell density adjacent to regions of necrosis; palisade = a fence of pales forming a defense barrier or fortification.
Images:
- Glioblastoma:
- Anaplastic astrocytoma:
Table of common gliomas - grading
Histomorphologic comparison of common gliomas:
| Entity | Rosenthal fibres / EGBs |
Nuclear atypia | Mitoses | Necrosis or MVP | Infiltrative | Image |
| Pilocytic astrocytoma | yes | usu. no | usu. no | usu. no | no | [1] |
| Low-grade astrocytoma | no | yes | no | no | yes | image? |
| Anaplastic astrocytoma | no | yes | yes | no | yes | [2] |
| Glioblastoma | no | yes | yes | yes | yes | [3] |
![[1]](http://commons.wikimedia.org/wiki/File:Rosenthal_HE_40x.jpg){kind=link}
Notes:
- MVP = microvascular proliferation.
- EGBs = eosinophilic granular bodies.
IHC
- GFAP - should stain cytoplasm of tumour cells and the perikaryon (nuclear membrane).
- Ki-67 - usu. high >20% of cells.
- p53 - often +ve.
- IDH1 (isocitrate dehydrogenase 1).
- +ve in tumours that arose from low-grade gliomas.[7]
- Image: IDH1 +ve in glioblastoma (WP).
- +ve in tumours that arose from low-grade gliomas.[7]
Notes:
- IDH1 and IDH2 mutations - better survival.[8]
Pilocytic astrocytoma
General
- Low-grade astrocytoma.
- Classically in the cerebellum in children; most common glioma in children.[9]
- The optic glioma associated with neurofibromatosis 1.
Gross
Features:[9]
- Usually well-circumscribed.
- Cystic or solid.
- Do not smear. (Ref. ?)
Microscopic
Features:[10]
- Classically biphasic (though either may be absent):
- Fibrillar.
- Microcystic/loose.
- Hair-like fibres ~ 1 micrometer; pilo- = hair.[11]
- Best seen on smear or with GFAP IHC.
- Rosenthal fibres - key feature.
- May be rare. Not pathognomonic (see below).
- Eosinophilic granular bodies.
- Low cellularity - when compared to medulloblastoma and ependymoma.
Notes:
- +/-Microvascular proliferation.
- +/-Focal necrosis.
- Necrosis with pseudopalisading more likely glioblastoma.
- +/-Mitoses - not significant in the context of the Dx.
Images:
- Smears:
- Sections:
DDx (of Rosenthal fibers):[12]
- Chronic reactive gliosis.
- Subependymoma.
- Ganglioma.
- Alexander's disease (rare leukodystrophy).
DDx of pilocystic astrocytoma (brief):
- Piloid gliosis.
- Oligodendroglioma.
- Glioblastoma (uncommon - but important).
IHC/special stains
Features:[13]
- GFAP +ve (fibres).
- PAS-D: eosinophilic granular bodies +ve.
- CD68: may have a significant macrophage component.
- KI-67: may be "high" (~20% ???).
Grading
- WHO Grade I by definition.
Pleomorphic xanthoastrocytoma
- Abbreviated PXA.
General
Features:
- Classically in the temporal lobe in children and young adults.
- Associated with seizures.
Microscopic
Features:[14]
- Marked nuclear atypia.
- Inflammation (chronic).
Notes:
- No mitoses.
- No necrosis.
Pilomyxoid astrocytoma
General
Features:[15]
- A variant of pilocytic astrocytoma.
- Some have suggested it is a unique entity.[16]
- Childhood or adolescence.
Gross
Features:[15]
- Classically - hypothalamic location/suprasellar location; may involve the sella turcica.[17]
- Solid.
- Well-circumscribed.
Microscopic
Features:[15]
- Consists of small round/ovoid bland cells in a myxoid stroma.
- Hair-like fibres ~ 1 micrometer.
- Often difficult to appreciate on standard (H&E) histologic sections.
- Usually angiocentric (surround blood vessel) - key feature.
Notes:[15]
- Rosenthal fibres are absent - key negative.
- Monophasic (unlike classical pilocytic astrocytomas) - key negative.
- May rarely have eosinophilic granular bodies.
Grading
- WHO Grade II by definition.[15]
Atypical teratoid/rhabdoid tumour
- See also: Extrarenal malignant rhabdoid tumour.
- Commonly abbreviated AT/RT.
- May be written atypical teratoid rhabdoid tumour, i.e. without the forward slash, or atypical teratoid-rhabdoid tumour (AT-RT).
General
- Usually supratentorial, occasionally in posterior fossa, case reports of spinal cord.
Microscopic
Features:
- Cellular.
- Small round cells usu. with a prominent nucleolus.
- Rhaboid cells.
- Cells with eosinophilic granular cytoplasm + eccentric nucleus. (???)
- Mitoses.
Images:
DDx:
- Primitive neuroectodermal tumour (PNET).
- Diffuse astrocytoma.
- Choroid plexus carcinoma.
- Embryonal carcinoma.
IHC
- BAF-47 -ve (AKA INI1) - virtually diagnostic.
- Endothelial cells +ve control.
- S-100 +ve.
- Few other brain tumours express it.
- Vimentin +ve (perinuclear condensation).
Others:
- GFAP +ve (focal - in tumour cells).
- EMA +ve (patchy cytoplasmic).
- Smooth muscle actin +ve.
Oligodendroglioma
General
- Do not arise from oligodendrocytes.
- Arise from glial precursor cells.
Usual location:
- Fourth ventricle.
- Intramedullary spinal cord.
Prognosis by flavours (average survival):[18]
- 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.
- Cells resembling fried eggs (oligodendrocytes) with:
- Calcifications - important feature.[19]
Images:
Notes:
- Few neural tumours have round nuclei - DDx:
- Oligodendroglioma.
- Lymphoma.
- Clear cell variant of ependymoma.
- Germ cell tumour (germinoma/dysgerminoma/seminoma).
Histologic grading
Come in two flavours:
- WHO grade II.
- This is most oligodendrogliomas.
- WHO grade III.
IHC
Features:
- MAP-2 +ve.[20]
- GFAP -ve.
- Some subtypes +ve - should not be used to distinguish.[21]
- 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:[22]
- Greater chemosensitivity
- Better prognosis.
Oligoastrocytoma
General
- Mixed tumour.
Microscopic
Features:
- Astrocytoma-like and oligodendroglioma-like:
- Oligodendroglioma-like cells = round nucleus, peri-nuclear clearing.
- Astrocytoma-like cells = non-ovoid/elongated nucleus.
DDx:
- Anaplastic astrocytoma.
- Oligodendroglioma. (???)
IHC
- Oligodendroglioma-like cells: MAP-2 +ve (cytoplasm).
- Astrocytoma-like cells: GFAP +ve (cytoplasm, nuclear membrane).
Others:
- Ki-67 ~10%. (???)
- p53 - focally +ve. (???)
- IDH-1 -ve. (???)
Meningioma
Main article: Meningioma
General
- Very common.
- May be part of a syndrome.
Microscopic
Features (memory device WC):
- Whorled appearance - key feature.
- Calcification, psammomatous.
Grading: see meningioma.
Peripheral nerve sheath tumours
Main article: Peripheral nerve sheath tumours
A classification:[23]
- Benign:
- Schwannoma.
- Neurofibroma.
- Perineurioma.
- Traumatic neuroma.
- Malignant:
Schwannoma
Main article: Peripheral nerve sheath tumours#Schwannoma
General
- Tumour of tissue surrounding a nerve.
- Axons adjacent to the tumour are normal... but may be compressed.
Microscopic
Features:[23]
- Antoni A:
- Cellular.
- 'Fibrillary, polar, elongated'.
- Antoni B:
- Pauci-cellular.
- Loose microcystic tissue.
- Verocay bodies - paucinuclear area surrounded by palisaded nuclei.
- In the GI tract: classically have a peripheral lymphoid cuff.[24]
Images:
Notes:
- Several subtypes exist.
Neurofibroma
Main article: Peripheral nerve sheath tumours#Neurofibroma
General
- May be a part of neurofibromatosis 1.
- Composed of Schwann cells, axons, fibrous material.[23]
Microscopic
Features:[23]
- Plexiform growth pattern - "bag of worms".
Image:
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Ganglioneuroma
General
Microscopic
Features:
- Ganglion cells - key feature.
- Large cells with large nucleus.
- Prominent nucleolus.
- Large cells with large nucleus.
- Disordered fibrinous-like material.
- Eosinophilic granular bodies.[26]
Images:
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See: Adrenal gland.
Ependymoma
General
- Called the forgotten glial tumour.
Epidemiology:[27]
- Usual site:
- Adults: usu. spinal cord.
- Children: usu. posterior fossa.
- May be assoc. with neurofibromatosis 2.
Comes in two flavours:
- Ependymoma (not otherwise specified).
- Myxopapillary ependymoma.
- Classically at filum terminale.
Microscopy
Classic ependymoma
Features:
- Cells have a "tadpole-like" morphology.
- May also be described as ice cream cone-shaped.[28]
- Rosettes = circular nuclear free zones/cells arranged in a pseudoglandular fashion; comes in two flavours in ependymoma:
- Perivascular pseudorosettes = (tumour) cells arranged around a blood vessel; nuclei of cells distant from the blood vessel, i.e. rim of cytoplasm (from tumour cells) surround blood vessel (nucleus-free zone); more common than ependymal rosette... but less specific.
- Ependymal rosette (AKA true ependymal rosette) = rosette has an empty space at the centre - key feature.
- Nuclear features monotonous, i.e. "boring".[29]
- There is little variation in size, shape and staining.
Images:
- Ependymoma - ependymal rosettes (ajnr.org).
- Ependymoma - intermed. mag. (WC).
- Ependymoma - low mag. (WC).
DDx (classic ependymoma):
- Subependymoma.
- Glioblastoma (GBM).
- Invasive border = GBM; circumscribed border of lesion = ependymoma.
Myxopapillary ependymoma
Features:
- Perivascular pseudorosettes:
- Myxoid material surround blood vessels.
- Myxoid material surrounded by tumour cells.
- Myxoid material surround blood vessels.
Images:
- Myxopapillary ependymoma (bmj.com) - part of careers.bmj.com article on paediatric pathology.
- Myxopapillary ependymoma - cytology (WC).
Grading
Easy:
- Subependymoma = WHO grade I.
- Myxopapillary ependymoma = WHO grade I.
Not-so-easy:
- Classic ependymoma = WHO grade II.
- Anaplastic ependymoma = WHO grade III.
Grade II vs. Grade III:
- Cellular density.
- Mitoses.
- Necrosis.
- Microvascular proliferation.
Notes:
- Many tumours fall between grade II and grade III. These are called "indeterminate" by many.
IHC
- Reticulin.
- GFAP.
- MIB-1.
Subependymoma
General
- Good prognosis - WHO Grade I.
Gross/radiology
- Classic location: fourth ventricle.[30]
- Well demarcated margin.
- Usu. completely within the ventricle; does not extend into brain (like ependymomas).
Microscopic
Features:[31]
- Microcysts with bluish material - give a spongy appearance at low magnification.
- Nuclei cluster.
- Described as "bundles of flowers".
Negatives.
- No nuclear pleomorphism, no prominent nucleoli, no mitoses.
Images:
Choroid plexus papilloma
Microscopy
Features:
- Simple epithelium.
- Papillae.
- Psammoma bodies.
Image:
Chordoma
General
- Location: usually sacrum or clivus.
Microscopic
Features:[32]
- Architecture: islands of cells surrounded by fibrous tissue.
- Also described as "lobulated" architecture; may not be apparent.
- Myxoid background - grey extracellular material, variable amount present.
- Mixed cell population:
- Abundant eosinophilic cytoplasm.
- Physaliphorous cells or bubble cells - key feature.
- Have a very large clear bubble with a sharp border; bubble does not compress nucleus - nucleus may be in bubble.
Images:
- Chordoma - low mag. (WC).
- Chordoma - high mag. (WC).
- Chordoma (med.utah.edu).
- Chordoma - several images (acl.ac.uk).
IHC
Features:
Hemangioblastoma
General
- Usually cerebellar.
- Associated with von Hippel-Lindau syndrome.
- WHO grade I.[35]
Microscopic
Features:[36]
- Vascular.
- Polygonal stromal cells with:
- Hyperchromatic nuclei.
- Vacuolar cytoplasm.
Images:
- Hemangioblastoma - intermed. mag. (WC).
- Hemangioblastoma - high mag. (WC).
- Hemangioblastoma - NSE - intermed. mag. (WC).
DDx:
- Metastatic clear cell renal cell carcinoma.
IHC
Features:[37]
- Alpha-inhibin +ve (cytoplasm).
- EMA -ve.
- RCC typically +ve.
- NSE +ve (nucleus + cytoplasm).
- RCC typically -ve.
Medulloblastoma
General
- Mostly paediatric population.
- May be seen as a component of nevoid basal cell carcinoma syndrome (NBCCS).
Gross
- Location: cerebellum - key feature.
- Morphologically identical supratentorial tumours are called primitive neuroepithelial tumour (PNET).
Microscopic
Features:[38]
- Small round cell tumour.
- Homer-Wright rosettes:
- Rosette with a meshwork of fibers (neuropil) at the centre.[39]
Image:
DDx:
Subtypes
- Classic medulloblastoma (~85% of all medulloblastomas).
- Variants of medulloblastoma (~15% of all medulloblastomas together):
- Anaplastic variant.
- Large cell variant.
- Desmoplastic/nodular medulloblastoma (DNMB).
- Medulloblastoma with extensive nodularity (MBEN).
Notes:
Anaplastic variant
Features:
- Larger cells.
- Severe anaplasia.
- Polygonal cells.
Primitive neuroepithelial tumour
General
- Abbreviated PNET.
- Should not be confused with peripheral primitive neuroepithelial tumour (abbreviated pPNET[42]), AKA Ewing sarcoma.
Microscopic
Features:
DDx: Embryonal tumor with abundant neuropil and true rosettes (ETANTR).[43]
CNS lymphoma
Classification:
- Primary CNS lymphoma.
- Non-primary CNS lymphoma - see lymphoma article.
General - primary CNS
- Classically periventicular distribution.
- Usually large B cell; can be considered a type of diffuse large B cell lymphoma (DLBCL).
- Prognosis of CNS (DLBCL) lymphomas worse than nodal (non-CNS) DLBCL.[44]
Microscopic
Features:
- Large cell lymphoma.
- Size = 2x diameter normal lymphocyte.
- Nucleolus - common.
- Perivascular clustering.
Images:
IHC
Can be subclassified in GCB (germinal centre B-cell-like) and non-GCB by CD10, Bcl-6, MUM1/IRF-4, and Bcl-2.[44]
Common pattern:
- CD20 +ve - key stain.
- CD3 -ve.
- Ki-67 ~40%.
- Bcl-6 +ve.
- Bcl-1 -ve.
Neurocytoma
General
- Rare.
Microscopic
Features:
- Pineocytomatous/neurocytic rosette = irregular rosette with a large meshwork of fibers (neuropil) at the centre.[45]
- Similar to Homer-Wright rosette.
Images:
Central neurocytoma
General
- Rare.
Microscopic
Features:[46]
- Perivascular pseudorosette = circular/flower-like arrangement of cells with blood vessel at the centre.[45]
- Islands of neuropil.
- Polygonal cells with a perinuclear halo.
DDx:
DDx of perivascular pseudorosette:
- Ependymoma.
- Medulloblastoma, PNET.
- Glioblastomas.
Images:
Lesions of the sella turcica
Main article: Pituitary gland
Lesions of the sella turcica, the pituitary gland environs, is a topic for it self. The differential diagnosis for lesions in this area includes:
- Pituitary adenoma.
- Craniopharyngioma.
- Rathke cleft cyst.
- Germ cell tumour.
- Meningioma.
- Pilomyxoid astrocytoma - in children.
See also
References
- ↑ http://neurosurgery.mgh.harvard.edu/abta/primer.htm
- ↑ URL: http://www.msdlatinamerica.com/ebooks/DiagnosticNeuropathologySmears/files/4ce563fb7e8e48fc9ed8b42e296a7747.gif and http://www.msdlatinamerica.com/ebooks/DiagnosticNeuropathologySmears/sid117213.html. Accessed on: 2 November 2010.
- ↑ JLK. 31 May 2010.
- ↑ R. Kiehl. 8 November 2010.
- ↑ Rong Y, Durden DL, Van Meir EG, Brat DJ (June 2006). "'Pseudopalisading' necrosis in glioblastoma: a familiar morphologic feature that links vascular pathology, hypoxia, and angiogenesis". J. Neuropathol. Exp. Neurol. 65 (6): 529–39. PMID 16783163.
- ↑ http://dictionary.reference.com/browse/palisading
- ↑ Yan H, Parsons DW, Jin G, et al. (February 2009). "IDH1 and IDH2 mutations in gliomas". N. Engl. J. Med. 360 (8): 765–73. doi:10.1056/NEJMoa0808710. PMC 2820383. PMID 19228619. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2820383/.
- ↑ Houillier C, Wang X, Kaloshi G, et al. (October 2010). "IDH1 or IDH2 mutations predict longer survival and response to temozolomide in low-grade gliomas". Neurology 75 (17): 1560–6. doi:10.1212/WNL.0b013e3181f96282. PMID 20975057.
- ↑ 9.0 9.1 Perry, Arie; Brat, Daniel J. (2010). Practical Surgical Neuropathology: A Diagnostic Approach: A Volume in the Pattern Recognition series (1st ed.). Churchill Livingstone. pp. 82. ISBN 978-0443069826.
- ↑ Perry, Arie; Brat, Daniel J. (2010). Practical Surgical Neuropathology: A Diagnostic Approach: A Volume in the Pattern Recognition series (1st ed.). Churchill Livingstone. pp. 82-4. ISBN 978-0443069826.
- ↑ URL: http://dictionary.reference.com/browse/pilo-. Accessed on: 24 November 2010.
- ↑ MUN. 9 Mar 2009.
- ↑ Perry, Arie; Brat, Daniel J. (2010). Practical Surgical Neuropathology: A Diagnostic Approach: A Volume in the Pattern Recognition series (1st ed.). Churchill Livingstone. pp. 84. ISBN 978-0443069826.
- ↑ Kumar, Vinay; Abbas, Abul K.; Fausto, Nelson; Aster, Jon (2009). Robbins and Cotran pathologic basis of disease (8th ed.). Elsevier Saunders. pp. 1333. ISBN 978-1416031215.
- ↑ 15.0 15.1 15.2 15.3 15.4 Perry, Arie; Brat, Daniel J. (2010). Practical Surgical Neuropathology: A Diagnostic Approach: A Volume in the Pattern Recognition series (1st ed.). Churchill Livingstone. pp. 86. ISBN 978-0443069826.
- ↑ Komotar RJ, Mocco J, Jones JE, et al. (June 2005). "Pilomyxoid astrocytoma: diagnosis, prognosis, and management". Neurosurg Focus 18 (6A): E7. PMID 16048293.
- ↑ Alimohamadi M, Bidabadi MS, Ayan Z, Ketabchi E, Amirjamshidi A (December 2009). "Pilomyxoid astrocytoma with involvement of the sella turcica in an adolescent". J Clin Neurosci 16 (12): 1648–9. doi:10.1016/j.jocn.2009.01.035. PMID 19766001.
- ↑ 18.0 18.1 Perry, Arie; Brat, Daniel J. (2010). Practical Surgical Neuropathology: A Diagnostic Approach: A Volume in the Pattern Recognition series (1st ed.). Churchill Livingstone. pp. 98. ISBN 978-0443069826.
- ↑ URL: http://www.emedicine.com/radio/topic481.htm.
- ↑ Suzuki SO, Kitai R, Llena J, Lee SC, Goldman JE, Shafit-Zagardo B (May 2002). "MAP-2e, a novel MAP-2 isoform, is expressed in gliomas and delineates tumor architecture and patterns of infiltration". J. Neuropathol. Exp. Neurol. 61 (5): 403–12. PMID 12025943.
- ↑ Perry, Arie; Brat, Daniel J. (2010). Practical Surgical Neuropathology: A Diagnostic Approach: A Volume in the Pattern Recognition series (1st ed.). Churchill Livingstone. pp. 98. ISBN 978-0443069826.
- ↑ Fontaine D, Vandenbos F, Lebrun C, Paquis V, Frenay M (2008). "[Diagnostic and prognostic values of 1p and 19q deletions in adult gliomas: critical review of the literature and implications in daily clinical practice]" (in French). Rev. Neurol. (Paris) 164 (6-7): 595–604. doi:10.1016/j.neurol.2008.04.002. PMID 18565359.
- ↑ 23.0 23.1 23.2 23.3 Wippold FJ, Lubner M, Perrin RJ, Lämmle M, Perry A (October 2007). "Neuropathology for the neuroradiologist: Antoni A and Antoni B tissue patterns". AJNR Am J Neuroradiol 28 (9): 1633–8. doi:10.3174/ajnr.A0682. PMID 17893219. http://www.ajnr.org/cgi/reprint/28/9/1633.
- ↑ Levy AD, Quiles AM, Miettinen M, Sobin LH (March 2005). "Gastrointestinal schwannomas: CT features with clinicopathologic correlation". AJR Am J Roentgenol 184 (3): 797–802. PMID 15728600. http://www.ajronline.org/cgi/content/full/184/3/797.
- ↑ URL: http://medical-dictionary.thefreedictionary.com/ganglioma. Accessed on: 8 November 2010.
- ↑ R. Kiehl. 8 November 2010.
- ↑ Kumar, Vinay; Abbas, Abul K.; Fausto, Nelson; Aster, Jon (2009). Robbins and Cotran pathologic basis of disease (8th ed.). Elsevier Saunders. pp. 1334. ISBN 978-1416031215.
- ↑ http://www.pathology.vcu.edu/WirSelfInst/tumor-2.html
- ↑ MUN. 6 Oct 2009.
- ↑ Hoeffel, C.; Boukobza, M.; Polivka, M.; Lot, G.; Guichard, JP.; Lafitte, F.; Reizine, D.; Merland, JJ.. "MR manifestations of subependymomas.". AJNR Am J Neuroradiol 16 (10): 2121-9. PMID 8585504. http://www.ajnr.org/cgi/reprint/16/10/2121.
- ↑ 31.0 31.1 URL: http://moon.ouhsc.edu/kfung/jty1/Com05/Com501-2-Diss.htm. Accessed on: 2 June 2011.
- ↑ Tadrous, Paul.J. Diagnostic Criteria Handbook in Histopathology: A Surgical Pathology Vade Mecum (1st ed.). Wiley. pp. 184. ISBN 978-0470519035.
- ↑ URL:http://www.ncbi.nlm.nih.gov/omim/601397. Accessed on: 18 May 2010.
- ↑ URL: http://www.jstor.org/pss/86845. Accessed on: 18 May 2010.
- ↑ URL: http://www.expertconsultbook.com/expertconsult/ob/book.do?method=display&type=bookPage&decorator=none&eid=4-u1.0-B978-1-4160-4580-9..00019-8--sc0155&isbn=978-1-4160-4580-9. Accessed on: 9 December 2010.
- ↑ URL: http://emedicine.medscape.com/article/340994-media. Accessed on: 23 June 2010.
- ↑ URL: http://www.nature.com/modpathol/journal/v18/n6/full/3800351a.html. Accessed on: 9 December 2010.
- ↑ URL: http://moon.ouhsc.edu/kfung/jty1/neurotest/Q93-Ans.htm. Accessed on: 26 October 2010.
- ↑ Wippold FJ, Perry A (March 2006). "Neuropathology for the neuroradiologist: rosettes and pseudorosettes". AJNR Am J Neuroradiol 27 (3): 488–92. PMID 16551982.
- ↑ Gulino A, Arcella A, Giangaspero F (November 2008). "Pathological and molecular heterogeneity of medulloblastoma". Curr Opin Oncol 20 (6): 668–75. doi:10.1097/CCO.0b013e32831369f4. PMID 18841049.
- ↑ Rutkowski S, von Hoff K, Emser A, et al. (November 2010). "Survival and Prognostic Factors of Early Childhood Medulloblastoma: An International Meta-Analysis". J Clin Oncol 28 (33): 4961–4968. doi:10.1200/JCO.2010.30.2299. PMID 20940197.
- ↑ PST. 14 February 2011.
- ↑ Buccoliero AM, Castiglione F, Degl'Innocenti DR, et al. (February 2010). "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". Neuropathology 30 (1): 84–91. doi:10.1111/j.1440-1789.2009.01040.x. PMID 19563506.
- ↑ 44.0 44.1 Raoux D, Duband S, Forest F, et al. (June 2010). "Primary central nervous system lymphoma: Immunohistochemical profile and prognostic significance". Neuropathology 30 (3): 232–40. doi:10.1111/j.1440-1789.2009.01074.x. PMID 19925562.
- ↑ 45.0 45.1 Wippold FJ, Perry A (March 2006). "Neuropathology for the neuroradiologist: rosettes and pseudorosettes". AJNR Am J Neuroradiol 27 (3): 488–92. PMID 16551982.
- ↑ URL: http://moon.ouhsc.edu/kfung/jty1/Com/Com307-1-Diss.htm. Accessed on: 27 May 2011.
