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Single selected pre and post contrast CT images through the brain demonstrates a hyperdense rounded focus in the region of the cuneus/precuneus surrounded by a small amount of oedema. Following contrast administration there is prominent ring enhancement with a central dot ("cyst with dot sign") characteristic of neurocysticercosis.
This case illustrates typical appearances of neurocysticercosis with the cyst with dot sign.
Case courtesy of Dr Douglas Graeb, Vancouver General Hospital.