Abstract：Objective: To study MRI findings of fibrous meningioma. Methods: MRI findings of 56 cases fibrous meningioma confirmed by surgery and pathology were analyzed retrospectively. All patient underwent conventional axial T1WI, T2WI, DWI and enhanced MRI scan. ADC map was obtained from DWI sequence by post-processing and ADC values of tumor and normal white matter in corresponding area were acquired. Conventional MRI, DWI findings and ADC values of fibrous meningioma were analyzed. Results: Compared with brain cortex, the tumors were isointense in 40 cases, hypointense in 14 cases and mixed signal intensity in 2 cases on conventional T1WI of MRI. On T2WI, the tumors were isointense in 35 cases, slightly high signal intensity in 12 cases, mixed signal intensity in 6 cases and hypointensity in 3 cases. Peritumormal edema was found in 16 cases. On enhanced T1WI, 34 cases showed homogeneous enhancement, 21 cases showed heterogeneous enhancement and 1 case showed ring-like enhancement. Dural tail sign was seen in 32 cases. On DWI, 31 cases showed isointensity, 12 cases showed slightly high signal intensity, 10 cases showed mixed signal intensity and 3 cases showed low signal intensity. On ADC map, 31 cases had isointensity, 15 cases had mixed signal intensity, 6 cases had slightly high signal intensity and 4 cases were low signal intensity. The difference of ADC values between tumor parenchyma and normal white matter was statistically significant(P<0.05). In the 16 patients with peritumoral edema, the difference of ADC values among normal white matter, tumor parenchyma and peritumoral edema was statistically significant(P<0.05). Conclusions: There are various of DWI findings for fibrous meningioma. DWI can work as a supplement means for diagnosis of fibrous meningioma based on conventional MRI.
2013, Vol. 24 
