zystisches Astrozytom

A polycystic
variant of a primary intracranial leptomeningeal astrocytoma: case report and literature review. CT scan showing a roundish, hypodense left fronto-parietal mass with a thinness satellite parietal bone (arrow). A contrast enhanced CT scan reveals any septa inside the tumour which give it a polycystic aspect.
wjso.biomedcentral.com • CC-by-2.0
A polycystic
variant of a primary intracranial leptomeningeal astrocytoma: case report and literature review. Sagittal T1 weighed MR showing the polycystic fronto-parietal tumour.
wjso.biomedcentral.com • CC-by-2.0
Cerebellar
pilocytic astrocytoma: MR spectroscopy. Shows cystic lesion with eccentric enhancing mural nodule in posterior fossa
www.eurorad.org • CC by-nc-sa-4.0
Pilocytic
astrocytoma - MRI appearance. MRI T2W axial image shows a well-defined hyperintense lesion with inner hypointense area noted in left cerebellum. The lesion shows mild perilesional oedema and causes compression over 4th ventricle resulting in mild hydrocephalus.
www.eurorad.org • CC by-nc-sa-4.0
Stereotactic
MRI brain showed recurrent postoperative brain stem cystic pilocytic astrocytoma.
Wikipedia • CC BY 2.0
Role of
diffusion-weighted imaging in differentiation between posterior fossa brain tumors. Juvenile pilocytic astrocytoma in a 9-year-old boy who presented with repeated headache and vomiting. a T1-weighted (T1WI) shows intra-axial cystic space-occupying lesion (SOL) in the left cerebellar hemisphere. b T2-weighted (T2WI) showing hyperintense cystic posterior fossa mass with isointense solid mural nodule attached to the inner side of the cystic mass. Note the cystic components and relatively solid components. c Post-contrast T1WI axial image showing mildly enhancing solid components and faint enhanced cystic wall. d Apparent diffusion coefficient (ADC) map: the cystic component is bright while the solid component is relatively lower than the cystic component with slight diffusion restriction
ejnpn.springeropen.com • CC-by-4.0
Cerebellar
pilocytic astrocytoma: MR spectroscopy. T2WI shows hyperintense lesion in posterior fossa with effaced 4th ventricle and triventricular hydrocephalus with eccenteric intermediate signal intensity solid component.
www.eurorad.org • CC by-nc-sa-4.0
Cerebellar
pilocytic astrocytoma: MR spectroscopy. T1WI shows hypointense lesion in the posterior fossa
www.eurorad.org • CC by-nc-sa-4.0
Lizenz: CC BY-SA 4.0

zystisches Astrozytom

Astrozytom Radiopaedia • CC-by-nc-sa 3.0 • de

Astrocytic tumors are primary central nervous system tumors that either arises from astrocytes or appear similar to astrocytes on histology having arisen from precursor cells. They are the most common tumors arising from glial cells.

They can be divided into those that are diffuse in growth (the vast majority, generally having higher grade and poorer prognosis) and those that are localized (tend to have a lower grade and better prognosis).

Additionally, some tumors also contain astrocytic components, and it is often this component that dictated biological behavior. Examples include:

All these tumors have strikingly differing imaging appearances, treatment and prognosis and thus they are, along with spinal astrocytomas discussed separately.

NB: gliomatosis cerebri, fibrillary astrocytoma and  protoplasmic astrocytoma are no longer recognized in the current WHO classification of CNS tumors

Siehe auch:
und weiter:
Assoziationen und Differentialdiagnosen zu zystisches Astrozytom:
Pilozytisches
Astrozytom
Wikipedia • CC BY-SA 3.0
Anaplastisches
Astrozytom
pediatricimaging.org • CC-by-nc-sa 4.0