Neuroradiology

, Volume 42, Issue 11, pp 824–827

A ring-enhancing metastasis with central high signal on diffusion-weighted imaging and low apparent diffusion coefficients

  • S. Holtås
  • B. Geijer
  • L.-G. Strömblad
  • P. Maly-Sundgren
  • I. M. Burtscher
DIAGNOSTIC NEURORADIOLOGY

DOI: 10.1007/s002340000431

Cite this article as:
Holtås, S., Geijer, B., Strömblad, LG. et al. Neuroradiology (2000) 42: 824. doi:10.1007/s002340000431

Abstract

Diffusion-weighted imaging (DWI) has been reported to be useful in the differential diagnosis between abscesses and cystic or necrotic tumours. However, experience is still limited and the true sensitivity and specificity remain to be determined. Our purpose is to describe a ring-enhancing metastasis of adenocarcinoma with a DWI pattern similar to that reported for abscesses. The tumour had a diameter of 1.5 cm and give signal from its centre similar to that of normal brain on T1-weighted images, whereas it was increased on T2-weighted images, and surrounded by a low signal ring, suggesting a capsule. The signal was high on DWI and the apparent diffusion coefficient (ADC) was low (0.55 × 10–3 mm2/s). The findings were misinterpreted as representing an abscess in the early capsule-formation stage, but the signal pattern probably represented early tumour necrosis with intracellular oedema, but without liquefaction. Findings on DWI during the early capsule formation stage in abscesses and early tumour necrosis are probably similar and must be interpreted with caution.

Key words Magnetic resonance imaging diffusion-weighted Abscess brain Tumour brain 

Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • S. Holtås
    • 1
  • B. Geijer
    • 1
  • L.-G. Strömblad
    • 2
  • P. Maly-Sundgren
    • 1
  • I. M. Burtscher
    • 1
  1. 1.Department of Radiology, University Hospital, 22185 Lund, Sweden e-mail: stig.holtas@drad.lu.se Tel.: + 46 46 17 30 60 Fax: + 4 64 62 11 69 56SE
  2. 2.Department of Neurosurgery, University Hospital, Lund, SwedenSE