Diffusion weighted imaging may help differentiate intracranial hemangiopericytoma from meningioma - 03/12/18

Doi : 10.1016/j.neurad.2018.11.002

Jai Jai Shiva Shankar ^a,^b,^⁎ , Luke Hodgson ^b, Namita Sinha ^c
^a Department of Radiology, University of Manitoba, Winnipeg, Canada
^b Department of Diagnostic Radiology, Dalhousie University, Halifax, Canada
^c Department of Pathology, University of Manitoba, Winnipeg, Canada

^⁎Corresponding author at: Department of Radiology, University of Manitoba, Winnipeg, MB R3L0E9, Canada.Department of RadiologyUniversity of ManitobaWinnipegMBR3L0E9Canada

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Abstract

Background and purpose

Hemangiopericytoma and meningioma appear similar on routine diagnostic imaging and hence are difficult to distinguish. The purpose of our study was to examine the diffusion weighted imaging (DWI) characteristics of these two types of tumours.

Methods

In a retrospective study, each patient with hemangiopericytoma was matched with two meningioma patients based on tumour location and size. Minimum and mean apparent diffusion coefficients (ADC) were measured in the tumour and the contralateral normal-appearing white matter (NAWM). A normalized ADC was calculated. The two tumour types were subjectively assessed for heterogeneity on ADC maps.

Results

Of the 14 patients with histopathological proven hemangiopericytoma, only 7 had available DWI for analysis. These 7 patients were matched based on tumour location and size with 14 patients out of the 209 meningioma patients screened. Hemangiopericytomas were more heterogeneous on ADC maps (P < 0.001) and had a higher mean ADC compared to that of meningiomas (P < 0.001).

Conclusion

Hemangiopericytomas showed heterogeneity on DWI and significantly higher ADC compared to that of meningiomas in our small study. These observations need to be confirmed in future studies with larger sample sizes.

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Keywords : Diffusion weighted imaging, Hemangiopericytoma, Meningioma