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| Investigation on DWI signals of high grade glioma with ring enhancement on MRI |
| YANG Yu1, ZHOU Zhi-hui1, LI Ping1, LOU Xin2 |
| 1.The First Hospital of Hunan University of Chinese Medicine, Changsha 410007, China;2.The General Hospital of the People’s Liberation Army, Beijing 100853, China |
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Abstract Objective: To investigate the characteristics of DWI signals in high grade gliomas with ring enhancement on MRI. Methods: DWI signals within ring enhanced areas in 19 cases of high grade gliomas were analyzed retrospectively. They were divided into 4 situations according to the image features. They were as followed: regional corresponding relation between the ring enhancement and DWI signal; regular or irregular shape of rings; with tension or not concerning on the ring shape; the ring wall is closed or not; MRI sequences included T2WI, T2WI-FLAIR, T1WI, DWI, enhanced T1WI with fat suppression. Results: All 19 cases showed ring enhancement on enhanced MRI. 16 cases showed high signal intensities on DWI which accorded or exceeded the scope of ring enhancement. DWI hyperintense area was smaller than the enhancement area in 3 cases. DWI high signal area showed a ring shape with no tension in 12 cases and with tension in 1 case. 6 cases did not show ring-like hyperintense area on DWI or their tension not to be judged. Hyperintense rings on DWI were irregular in 12 cases and regular in 1 case. No hypertense rings on DWI were formed in 6 cases which led to bad judgement; Hyperintense rings on DWI(closed loops) were found continuous in 11 cases and interrupted(open loop) in 2 cases. Conclusion: In high grade gliomas with ring enhancement, DWI high signal areas generally accorded to the enhancement or exceeded its range. When DWI showed a hyperintense ring, its characteristics were irregular in shape, with no tension and a closed loop. Hemorrhage could cause unobvious characteristics of the ring on DWI. There is much value for these imaging features in the diagnosis of intracranial high grade gliomas.
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Received: 30 July 2014
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2015, Vol. 26 
