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7.1a. Contrast axial T1 Wtd MRI - PowerPoint PPT Presentation


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7.1a. Contrast axial T1 Wtd MRI. 7.1b. Contrast coronal T1 Wtd MRI. 7.1c. Contrast sagittal T1 Wtd MRI. Figure 7.1: An enhancing ring lesion within the left posterior frontal lobe. Diagnosis:. Pyogenic Abscess Differential diagnosis : Metastasis

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slide1

7.1a. Contrast axial T1 Wtd MRI

7.1b. Contrast coronal T1 Wtd MRI

7.1c. Contrast sagittal T1 Wtd MRI

Figure 7.1: An enhancing ring lesion within the left posterior frontal lobe

Diagnosis:

Pyogenic Abscess

Differential diagnosis: Metastasis

While abscess can be differentiated from metastasis by MR imaging, appropriate patients clinical history and clinical findings are needed to aid in accurate diagnosis.

slide2

7.2a,b,c. Pre-Contrast axial T1 Wtd MRI

7.2d,e,f. Post-Contrast axial T1 Wtd MRI

Figure 7.2: Multiple enhancing ring lesions in a immunocompromised patient

Diagnosis:

Fungal Abscesses

Differential diagnosis: Multiple Metastasis

While abscess can be differentiated from metastasis by MR imaging, appropriate patients clinical history and clinical findings are needed to aid in accurate diagnosis.

slide3

Fig 7.3a. T2-weighted images of the brain at just above the level of roof of the lateral ventricles of a young homosexual man.

Findings:

Diagnosis:

Areas of T2-weighted hyperintensity within the deep paraventricular white matter (arrows).

Human Immunodeficiency Virus (HIV) Encephalopathy

A myelin-stained section of the brain specimen reveals severe diffuse myelin pallor (*).

Horizontal section of the brain revealing abnormal left frontal lobe white matter from demyelinization (arrow).

slide4

Fig. 7.3b. T2-weighted image of the brain at the level of frontal horns of a young homosexual man

Findings:

Diagnosis:

Foci of T2-weighted hyperintensity involving the peripheral white matter at or close to cortico-medullary junction (arrows) and left basal ganglia (arrow head).

Progressive Multifocal Leukoencephalopathy

slide5

Fig 7.3c. Post-contrast axial CT image of the brain at the level of frontal horns/basal ganglia of a young homosexual man.

Findings:

Diagnosis:

Enhancing ring lesion (arrow) within the left caudate nucleus.

Primary CNS Lymphoma

Coronal brain section reveals a tumor involving the left caudate nucleus (arrows).

Photomicrographic show perivascular collections of lymphoma cells

slide6

Fig 7.3d. Post-contrast axial CT image of the brain at the level of the basal ganglia of a drug addict

Findings:

Diagnosis:

Enhancing ring lesion (arrow) within the right caudate nucleus.

CNS Toxoplasmosis

Horizontal section of the right hemisphere reveals an irregular necrotic lesion in the right caudate nucleus

slide7

Fig. 7.3e. T1-weighted image of the brain at the level of frontal horns of a young homosexual man

7.3e. Pre-Contrast Axial T1 Wtd MRI

Diagnosis:

Findings:

Focal area of T1 Wtd low signal intensity, capping the right frontal horn.

Cytomegalo Virus Infection.

slide8

Fig 7.3f. Axial T2 Wtd image of the Brain.

Diagnosis:

Findings:

Cryptococcal Meningitis

Multiple small areas of increased T2 Wtd signal within both basal ganglia (arrows).

Coronal brain section reveals multiple soap-bubble like lesions in the basal ganglia (arrows).

Photo micrograph reveals encapsulated Cryptococcus neoformans with budding forms (arrow).