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A heterogeneous mass is present within the trigone of the left lateral ventricle with areas of cystic change, enhancement and hemorrhage / calcification. There is some adjacent edema in the parenchyma.
The patient went on to have a resection and histology confirmed the diagnosis of a pilocytic astrocytoma.
Although pilocytic astrocytomas are usually thought of in the context of posterior fossa masses in children they can present in adults and ventricles are a recognized location for these tumors.