Objectives:
MRI features of intracranial meningiomas may guide in terms of invasion and histopathological grades. The aim of this study is to evaluate the MRI features of meningiomas with dural invasion and grade 1 and 2 menengiomas.
Materials and Methods:
Seventy patients with preoperative MRI included to the study. WHO grades, precence of dura invasion, size, contact angle with dura, contact surface lenght, relationship with sutures, diffusion and apparent diffusion coefficient (ADC) values, presence of peritumoral edema, enhancement, contours and adjacent bone changes were evaluated retrospectively. Patients were divided into groups in terms of presence of histopathological dura invasion and WHO grades. Histopathological features and MRI findings were compared between the groups.
Results:
For WHO grades and MRI findings there were no statistically significant difference between meningiomas with and without dura invasion (p>0.05). Percentages of presence of the following parameters were significantly higher in grade 2 meningiomas: Diffusion restriction (p=0.038), localisation near a suture (p=0.010), peritumoral edema (p=0.006), heterogenous enhancement (p=0.027), lobulated contour of parenchymal surface (p=0.002) and adjacent bone scalloping (p=0.029). Anteroposterior (p=0.003) and craniocaudal (p=0.047) lenght of lesions, contact surface lenght (p=0.015) and mean age (p=0,030) were significantly higher in grade 2 meningiomas.
Conclusion:
In the differentiation of grade 1 and 2 menengiomas, besides the ADC values, and peritumoral edema; adjacent bone scalloping, contact surface lenght, heterogenous enhancement and localisation near the sutures may also help. For dura invasion there is no significant MRI finding.
Keywords: Meningeal Neoplasms, Intracranial Meningioma, Magnetic Resonance Imaging
