Abstract

MIGLIARO, M.  and  BESADA, C.. Espectroscopia y difusión por resonancia magnética para la caracterización del linfoma del sistema nervioso central. Rev. argent. radiol. [online]. 2014, vol.78, n.4, pp.199-205. ISSN 1852-9992.

Purpose: To show the imaging findings in cases of central nervous system (CNS) lymphoma with conventional and functional (diffusion and spectroscopy) magnetic resonance imaging (MRI) techniques, emphasizing the contributions that advanced imaging techniques provides to improve the diagnostic accuracy and rule out other tumors. Materials and methods: Between June 2008 and January 2012 we studied 26 inmunocompetent patients with diagnosis of central nervous system tumor, confirmed by pathology. These patients performed a brain MRI with conventional and functional techniques (diffusion and spectroscopy) and with gadolinium before surgery or biopsy. Results: We included 26 inmunocompetent patients, 13 men and 13 women. Eight patients with diagnosis of primary CNS lymphoma and 18 with other tumors: glioblastoma (n=9), anaplastic oligoastrocytoma (n=3), metastases with necrosis (n=4), and medulloblastoma (n=2). Ten of the 26 lesions showed restricted diffusion, this happened in all lymphomas and in both medulloblastomas. This is due to the high cellularity of the tumors. Spectroscopy showed increased lipids in all tumors. The difference among the tumors was the place of the measurement of lipids. Both medulloblastoma and lymphomas showed a lipid peak in the solid portion of the tumor while the remaining tumors showed lipids in the necrotic areas. Conclusion: The combination of conventional and functional MRI techniques with intravenous contrast improve the diagnostic accuracy of CNS lymphoma.

Keywords : Central Nervous System; Lymphoma; Magnetic Resonance; Imaging; Spectroscopy; Diffusion; Lipids.

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