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01-03-2009 | Diagnostic Neuroradiology

Ring-shaped lateral ventricular nodules: an incidental finding on brain magnetic resonance imaging

Authors: Taro Shimono, Makoto Hosono, Ryuichiro Ashikaga, Seishi Kumano, Izumi Imaoka, Yukinobu Yagyu, Masahiro Okada, Masatomo Kuwabara, Takamichi Murakami

Published in: Neuroradiology | Issue 3/2009

Abstract

Introduction

We have occasionally seen ring-shaped lateral ventricular nodules <1 cm in diameter during routine brain magnetic resonance imaging (MRI). We investigated retrospectively clinical and MRI findings of the nodules.

Materials and methods

Review of radiological records was performed for 39,607 patients who underwent brain MRI between January 2001 and April 2008. Nodules were assessed for number, location, shape, and signal intensity, which was determined based on the range of signal intensity from gray to white matter on T1- and T2-weighted imaging. Fluid-attenuated inversion recovery (FLAIR) and diffusion-weighted imaging (DWI), contrast enhancement characteristics, and serial MRI changes of nodules were assessed when available.

Results

Nine of 39,607 patients (0.023%) showed the nodules. No symptoms associated with the nodules. Among the nine patients, 11 nodules were identified (one nodule in seven patients (77.8%) and two nodules in two patients (22.2%)). Location was limited to the roof of the body for six nodules (54.5%) and the frontal horn for five patients (45.5%). All nodules (100%) were round and isointense on T1- and T2-weighted imaging. On FLAIR imaging of eight nodules, six (75%) were hyperintense, and two (25%) were isointense. On DWI of seven nodules, all nodules (100%) were isointense. None of seven nodules (0%) examined using postcontrast MRI showed enhancement. None of eight nodules (0%) examined using serial MRI (range, 4–60 months) showed changes in morphology over time.

Conclusion

These nodules were incidentally encountered and shared similar MRI features. Although pathological confirmation was lacking in our cases, these nodules may be of nonaggressive nature.

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Title: Ring-shaped lateral ventricular nodules: an incidental finding on brain magnetic resonance imaging
Authors: Taro Shimono
Makoto Hosono
Ryuichiro Ashikaga
Seishi Kumano
Izumi Imaoka
Yukinobu Yagyu
Masahiro Okada
Masatomo Kuwabara
Takamichi Murakami
Publication date: 01-03-2009
Publisher: Springer-Verlag
Published in: Neuroradiology / Issue 3/2009
Print ISSN: 0028-3940
Electronic ISSN: 1432-1920
DOI: https://doi.org/10.1007/s00234-008-0476-5

At a glance: The STEP trials

Springer Medicine

Ring-shaped lateral ventricular nodules: an incidental finding on brain magnetic resonance imaging

Abstract

Introduction

Materials and methods

Results

Conclusion

At a glance: The STEP trials

Springer Medicine

Abstract

Introduction

Materials and methods

Results

Conclusion

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