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A 10 year old boy presented with complaints of fever, headache, and vomiting for 5 days. He had a history of craniotomy for removal of a benign cyst on the right side, 8 months previously (figure A). Review of previous CT showed a smooth walled cystic space occupying besion roughly 8 cm in diameter in the right temporoparietal region. There was effacement of the ipsilateral ventricle with midline shift of 18 mm to left. No evidence of calcification or surrounding oedema was seen. The skull vault was thinned out, showing an obvious bulge. On contrast enhanced CT the lesion did not take up any contrast, but was better defined. Surgical notes showed a large white, thick walled, cystic mass roughly 7.5 cm in diameter which was excised. Histopathology showed it to be an hydatid cyst.
Brain CT at the second admission showed new and multiple attached cystic lesions in the right cerebral hemisphere (figure B). The larger cyst showed internal septations suggestive of daughter cysts. A moderate amount of surrounding oedema was seen. Right lateral and third ventricles were compressed and pushed to the left. The patient was treated conservatively.
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