1. Normal proton spectroscopy of the brain
Normal proton spectroscopy of the brain.
NAA = N-acetyl-L-aspartate; Cr = creatine; Cho = choline; MI = Myo-inositol.
2. Anaplastic astrocytoma
A. A T2-weighted MR image of a 15-year-old patient with seizures shows a hyperintense right parietal lobe lesion. B. The enhancing tumor (arrow) on the T1-weighted image obtained after gadolinium injection is much smaller, suggesting that much of the T2 signal abnormality is due to peritumoral edema.
3. Pilocytic astrocytoma of the thalamus
Pilocytic astrocytoma of the thalamus.
This 11-year-old male with papilledema presented with a 2-week history of headaches and intermittent nausea, vomiting, and diplopia. A. Unenhanced CT shows a cystic mass of the left thalamus, with a solid mural nodule. There is obstructive hydrocephalus. Peritumoral edema produces hypoattenuation in the left basal ganglia and adjacent white matter. B. A coronal FLAIR MR image shows peritumoral and periventricular edema. The mural nodule is slightly hyperintense. C. There is intense contrast enhancement of the mural nodule on this T1-weighted image obtained with IV gadolinium.
A. A coronal FLAIR image of a 9-year-old child shows a large cystic lesion in the right parietal lobe. There is a multinodular intraluminal component medially (arrow). There is extensive hyperintense perilesional edema. B. The medial solid component enhances intensely with IV gadolinium on this T1-weighted sequence. The margins of the tumor cyst are well-defined.
This is an 8-year-old girl with right hemiparesis, aphasia, and seizures. A, B. T2-weighted images show hyperintensity in a large region of the left cerebral hemisphere, without a definable mass. There is rightward shift of midline structures. C. The contrast enhancement characteristics of the brain are normal. Stereotactic biopsy demonstrated a high-grade astrocytoma.
6. Gemistocytic astrocytoma
A. There is a large hypointense area in the right frontoparietal region on this T1-weighted MR image. Mild mass effect is present. B. This infiltrative tumor is hyperintense on a FLAIR sequence. C. Most of the lesion is isointense ...
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