Posterior fossa tumors

Als

Zufallsbefund in der Magnetresonanztomographie entdecktes Lipom der Vierhügelplatte bei eine 69-jährigen. Links in T2 mäßig signalreich, in der Mitte in T1 KM (auch ohne) und rechts in FLAIR sehr signalreich.

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Patterns of

relapse in primary central nervous system lymphoma: inferences regarding the role of the neuro-vascular unit and monoclonal antibodies in treating occult CNS disease. Case 4; Axial T1 WI post contrast imaging at initial presentation (a, b) and relapse (c, d). At initial presentation there is a solitary right cerebellar lesion (a) with normal supra-tentorial compartment (b). After 10 months of high-dose MTX treatment, relapse was noted in the splenium of the CC with extension to the periventricular white matter (d) with no evidence of residual disease in the cerebellum (c)

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Brain MRI

showing primary central nervous system B-cell non-Hodgkin lymphoma of the sella turcica and hypothalamus, continuing to the tectum.

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Hemangioblastoma

(central nervous system) • Posterior fossa hemangioblastoma - Ganzer Fall bei Radiopaedia

Thapa S, Posterior fossa hemangioblastoma. Case study, Radiopaedia.org (Accessed on 11 Jan 2023) https://doi.org/10.53347/rID-40570 • CC by-nc-sa 3.0 (modified)

Posterior

fossa tumors • Posterior fossa ependymoma - Ganzer Fall bei Radiopaedia

Salam H, Posterior fossa ependymoma. Case study, Radiopaedia.org (Accessed on 03 Feb 2023) https://doi.org/10.53347/rID-8613 • CC by-nc-sa 3.0 (modified)

Pilocytic

astrocytoma • Pilocytic astrocytoma - Ganzer Fall bei Radiopaedia

Gaillard, F. Pilocytic astrocytoma. Case study, Radiopaedia.org. (accessed on 25 Oct 2022) https://doi.org/10.53347/rID-6493 • CC by-nc-sa 3.0 (modified)

Medulloblastoma

• Medulloblastoma - Ganzer Fall bei Radiopaedia

Gaillard, F. Medulloblastoma. Case study, Radiopaedia.org. (accessed on 04 Nov 2022) https://doi.org/10.53347/rID-6494 • CC by-nc-sa 3.0 (modified)

Posterior

fossa tumors • Posterior fossa ependymoma - Ganzer Fall bei Radiopaedia

Gaillard F, Posterior fossa ependymoma. Case study, Radiopaedia.org (Accessed on 03 Feb 2023) https://doi.org/10.53347/rID-5217 • CC by-nc-sa 3.0 (modified)

Trigeminal

neuralgia and posterior fossa meningioma: case report and review of literature. Posterior fossa MR imaging: more caudal sections show contrast-enhanced lesion attached to the dura

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Trigeminal

neuralgia and posterior fossa meningioma: case report and review of literature. Posterior fossa MR imaging of the right trigeminal neuralgia patient. The lesion on the right side of the V. nerve (possibly vascular structure) is visible. This structure during surgery has been found to be compatible with the superior cerebellar artery

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Patterns of

relapse in primary central nervous system lymphoma: inferences regarding the role of the neuro-vascular unit and monoclonal antibodies in treating occult CNS disease. Case 3; Axial T1-weighted post contrast imaging at initial presentation (a, b), after completing therapy with HD-MTX (c) and relapse (d). Initial presentation shows a large enhancing lesion in the left frontal lobe (a) and normal cerebellum (b). Patient was in complete response after completing 1 year of HD-MTX treatment (c) with radiographic relapse in the right cerebellum, 6 years after the initial diagnosis (d)

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Role of

diffusion-weighted imaging in differentiation between posterior fossa brain tumors. Epidermoid cyst in 38-year-old male complaining from auditory problems. A lobulated extra-axial cystic lesion is seen in the right cerebellopontine angle (CPA) insinuating itself, compressing the pons, extending into prepontine cistern, and encasing the basilar artery. It displays low T1WI signal intensity (a) and high T2WI signal intensity cerebrospinal fluid (CSF) like (b). On FLAIR, it shows low SI (partially suppressed SI (c). It shows faint marginal enhancement on post-contrast study (d). It shows iso SI-like brain parenchyma (restricted diffusion); it does not have high CSF SI-like arachnoid cyst (e)

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Role of

diffusion-weighted imaging in differentiation between posterior fossa brain tumors. Typical cerebellar (infratentorial) meningioma in female patient aged 44 years old presented with chronic headache and dizziness 4 months ago. An extra-axial space-occupying lesion (SOL) is seen in the left cerebellar hemisphere lying below and contacting the tentorium cerebelli with moderate perifocal edema, effacement of related cerebellar folia, compression of the fourth ventricle, and minimal rightward shift of midline structures. This mass displays relatively iso to low signal intensity (SI) on T1WI (a), iso SI on T2 WI (b). It shows homogeneous enhancement on post-contrast T1WI (c). It has iso SI-like brain parenchyma on apparent diffusion coefficient images (ADC) map (d)

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Role of

diffusion-weighted imaging in differentiation between posterior fossa brain tumors. Typical MRI features of a medulloblastoma in a 3-year-old child who presented with chronic headache 5 months ago. a T1WI shows midline vermian hypointense mass in the posterior fossa causing anterior displacement of the fourth ventricle. b T2WI: the mass appears isointense to slightly hyperintense. Few T1WI hypointense and T2WI hyperintense foci suggestive of cystic components. c Post-contrast T1WI axial image showing intense enhancement of the mass. d Low signal on apparent diffusion coefficient images (ADC), features suggestive of restricted diffusion corresponding to hypercellularity of the mass

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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

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