T2 and DWI in pilocytic and pilomyxoid astrocytoma with pathologic correlation
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 review...
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| Hauptverfasser: | , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
02 December 2014
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| In: |
The journal
Year: 2012, Jahrgang: 39, Heft: 4, Pages: 491-498 |
| ISSN: | 2057-0155 |
| DOI: | 10.1017/S0317167100014013 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1017/S0317167100014013 Verlag, kostenfrei, Volltext: https://www.cambridge.org/core/journals/canadian-journal-of-neurological-sciences/article/t2-and-dwi-in-pilocytic-and-pilomyxoid-astrocytoma-with-pathologic-correlation/98F664FBF5500C1DEDDAAA22FAE27214 
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| Verfasserangaben: | M. Horger, M.N. Vogel, R. Beschorner, U. Ernemann, J. Wörner, M. Fenchel, F. Ebner, T. Nägele, S. Heckl |
| Zusammenfassung: | 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. |
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| Beschreibung: | Published online: 02 December 2014 Gesehen am 04.09.2018 |
| Beschreibung: | Online Resource |
| ISSN: | 2057-0155 |
| DOI: | 10.1017/S0317167100014013 |