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T2 and DWI in Pilocytic and Pilomyxoid Astrocytoma with Pathologic Correlation

Published online by Cambridge University Press:  02 December 2014

M. Horger
Affiliation:
Department of Diagnostic and Interventional Radiology, Eberhard-Karls-University, Tübingen
M. N. Vogel*
Affiliation:
Department of Diagnostic and Interventional Radiology, Eberhard-Karls-University, Tübingen Department of Neuroradiology, University of Heidelberg, Heidelberg, Germany
R. Beschorner
Affiliation:
Institute for Brain Research, Eberhard-Karls-University, Tübingen
U. Ernemann
Affiliation:
Department of Diagnostic and Interventional Neuroradiology, Eberhard-Karls-University, Tübingen
J. Wörner
Affiliation:
Department of Diagnostic and Interventional Radiology, Eberhard-Karls-University, Tübingen
M. Fenchel
Affiliation:
Department of Diagnostic and Interventional Neuroradiology, Eberhard-Karls-University, Tübingen
F. Ebner
Affiliation:
Department of Neurosurgery, Eberhard-Karls-University, Tübingen
T. Nägele
Affiliation:
Department of Diagnostic and Interventional Neuroradiology, Eberhard-Karls-University, Tübingen
S. Heckl
Affiliation:
Department of Diagnostic and Interventional Neuroradiology, Eberhard-Karls-University, Tübingen
*
Department of Neuroradiology, University of Heidelberg, Heidelberg, Germany. Email: m.n.a.vogel@web.de
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Abstract

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Objective:

To quantify and compare T2 signal and apparent diffusion coefficient (ADC) in pilocytic and pilomyxoid astrocytoma (PA and PMA) and correlate results with myxoid content.

Methods:

Echo-planar diffusion weighted images (DWI) and standard magnetic resonance imaging (MRI) findings were reviewed retrospectively in patients with PA (n=34) and PMA (n=8). Regions of interest (ROIs) were drawn on ADC maps within tumor parts with lowest ADC values. Apparent diffusion coefficient values in tumor were normalized to those in cerebrospinal fluid (ADC/CSF). The ratio of T2 signal intensity in solid tumor parts to CSF (T2/CSF) was registered. Myxoid matrix was histologically quantified retrospectively in 8 PMAs and 17 PAs and correlated with imaging findings.

Results:

Mean ADC/CSF for PA and PMA was 0.53±0.10 and 0.69±0.10 (p<0.01). Mean T2/CSF for PA and PMA was 0.78±0.19 and 0.93±0.09 (p<0.01). Mean proportion of myxoid tumor matrix in PA was 50% (range, 10-100%) and 93% (range, 90-100%) in PMA (p=0.004). Eight patients (32%; all PA) had less than 50% myxoid content and 17 (68%; 8 PA; 9 PMA) had more. There was positive correlation of ADC/CSF, T2/CSF and ADC (r2=0.61, 0.65 and 0.60 respectively) and significant difference between the groups with more and less than 50% myxoid content (p=0.01 for ADC/CSF and T2/CSF and p=0.02 for ADC).

Conclusions:

General imaging features of PA and PMA are non-specific, ADC values and T2 signal intensity are generally higher in the latter, reflecting the proportion of myxoid matrix in these tumors.

Type
Original Article
Copyright
Copyright © The Canadian Journal of Neurological 2012

References

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