Differentiating between tumoral and pseudotumoral lesions by conventional MR imaging may be a challenging question. An MR imaging examination suggesting a pseudotumoral mass would indicate laboratory tests and/or follow-up. On the other hand, if a tumoral mass is suggested, stereotactic biopsy or surgical resection should be considered. MR spectroscopy is used to characterize biochemical components of normal and abnormal brain tissue. This study aims to evaluate the potential usefulness and the added value that proton MR spectroscopy could provide on this discrimination.