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Worsening vertigo and unsteadiness in an adult

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Q1: Describe the CT scan findings; what are the possible diagnoses?

The CT scan shows a midline non-enhancing hypodense lesion within the posterior fossa, which displaces the fourth ventricle anteriorly and to the right. There is no surrounding oedema. There is an associated non-communicating hydrocephalus as shown by dilatation of the third and lateral ventricles. Posterior fossa tumours are more common in children. In adults the differential diagnosis for a cystic posterior fossa tumour include …

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