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Figure 1. CT and MRI images showing blood–fluid levels in cases of primary intracranial malignancies and metastases to the brain. (a) The preliminary CT of a 45-year-old man with frontal lobe signs and intractable seizures reveals a wedge-shaped hypodensity in the right fronto-parietal region with predominant involvement of the white matter. As erosion of the inner table of the skull was overlooked, the lesion was misdiagnosed as an arterial infarct. (b) A CT done 26 months later reveals a lesion of mixed attenuation with an enhancing solid and a larger septated cystic component in the fronto-parietal region, which extends across the midline along white matter tracts of the corpus callosum. Scalloped erosion of the inner skull table adjacent to the tumour and nodular calcification (seen on the higher sections) suggested an oligodendroglioma.
