A 44 year old man began exhibiting bizarre personality changes,noted first by his wife.She brought him to the local Emergency Department,where a neuropsychiatrist ordered a CT scan.The scan revealed a 3 cm,well-demarcated tumour in the frontal lobes.Calcification was evident within the tumour.A neurosurgeon was consulted,and the tumour was later removed without incident.The patient returned to his normal state.A representative section of the tumour is shown in the accompanying photomicrograph.Which one of the following is the best diagnosis?

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The clinical history and histology both suggest oligodendrogliomAThe cells have a bland appearance,with a "fried egg" halo seen in the cytoplasm.The delicate vascular network is also typical.Although high grade tumours do occur,the majority are low grade and have a relatively good prognosis,especially when associated with a particular molecular signaturE

A 44 Year Old Man Began Exhibiting Bizarre Personality Changes,noted