A 37 year old man had suffered from hemiplegia for several years.He had been told it was multiple sclerosis.A neurologist suspected that the diagnosis was incorrect,and ordered a CT scan of the patient's cervical spine.The scan revealed a central tumour,which was pressing on the corticospinal tract.A neurosurgeon was able to completely remove the tumour,which is shown in the accompanying photomicrograph.Which one of the following is the best diagnosis? 
Definitions:
Cost Center
A division or a department within an organization that does not directly contribute to profit but incurs costs.
Joint Cost
The cost incurred in the process of producing two or more joint products before the point where these products are separately identifiable.
Investment Center
A segment or division within a company for which direct responsibility is given to a manager, who is judged by the profitability and the return on investment of the division.
Flexible Budgets
Flexible budgets are financial plans that can vary depending on actual levels of output, activity, or revenue, allowing businesses to adjust their spending and resources more dynamically.
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