Neuroradiology

, Volume 41, Issue 3, pp 171–174

Role of diffusion-weighted echo-planar MRI in distinguishing between brain abscess and tumour: a preliminary report

Authors

  • K. Noguchi
    • Department of Radiology, Toyama Medical and Pharmaceutical University, 2630, Sugitani, Toyama City, Toyama, 930-0194, Japan Tel.: + 81-764-34-2281 Fax: + 81-764-34-5031
  • N. Watanabe
    • Department of Radiology, Toyama Medical and Pharmaceutical University, 2630, Sugitani, Toyama City, Toyama, 930-0194, Japan Tel.: + 81-764-34-2281 Fax: + 81-764-34-5031
  • T. Nagayoshi
    • Department of Radiology, Toyama Medical and Pharmaceutical University, 2630, Sugitani, Toyama City, Toyama, 930-0194, Japan Tel.: + 81-764-34-2281 Fax: + 81-764-34-5031
  • T. Kanazawa
    • Department of Radiology, Toyama Medical and Pharmaceutical University, 2630, Sugitani, Toyama City, Toyama, 930-0194, Japan Tel.: + 81-764-34-2281 Fax: + 81-764-34-5031
  • S. Toyoshima
    • Department of Radiology, Toyama Medical and Pharmaceutical University, 2630, Sugitani, Toyama City, Toyama, 930-0194, Japan Tel.: + 81-764-34-2281 Fax: + 81-764-34-5031
  • M. Shimizu
    • Department of Radiology, Toyama Medical and Pharmaceutical University, 2630, Sugitani, Toyama City, Toyama, 930-0194, Japan Tel.: + 81-764-34-2281 Fax: + 81-764-34-5031
  • H. Seto
    • Department of Radiology, Toyama Medical and Pharmaceutical University, 2630, Sugitani, Toyama City, Toyama, 930-0194, Japan Tel.: + 81-764-34-2281 Fax: + 81-764-34-5031
DIAGNOSTIC NEURORADIOLOGY

DOI: 10.1007/s002340050726

Cite this article as:
Noguchi, K., Watanabe, N., Nagayoshi, T. et al. Neuroradiology (1999) 41: 171. doi:10.1007/s002340050726

Abstract

Our purpose was to evaluate diffusion-weighted (DW) echo-planar MRI in differentiating between brain abscess and tumour. We examined two patients with surgically confirmed pyogenic brain abscess and 18 with metastatic brain tumours or high-grade glioma, using a 1.5 T system. The apparent diffusion coefficient (ADC) of each necrotic or solid contrast-enhancing lesion was measured with two different b values (20 and 1200 s/mm2). All capsule-stage brain abscesses (4 lesions) and zones of cerebritis (2 lesions) were identified on high-b-value DWI as markedly high-signal areas of decreased ADC (range, 0.58–0.70 [(10–3 mm2/s; mean, 0.63)]). All cystic or necrotic portions of brain tumours (14 lesions) were identified on high-b-value DWI as low-signal areas of increased ADC (range, 2.20–3.20 [(10–3 mm2/s; mean, 2.70)]). Solid, contrast-enhancing portions of brain tumours (19 lesions) were identified on high-b-value DWI as high-signal areas of sightly decreased or increased ADC (range, 0.77–1.29 [(10–3 mm2/s; mean, 0.94)]). Our preliminary results indicate that DW echo-planar MRI be used for distinguishing between brain abscess and tumour.

Key words Magnetic resonance imagingDiffusion-weighted imagingBrain abscessBrain tumour
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© Springer-Verlag Berlin Heidelberg 1999