Atypical Meningioma.

 A 59 years old female patient presenting with headache. T1 and post contrast MR images are attached. What s the diagnosis? Atypical Meningioma.

Approximately 90% of all meningiomas fall into the benign category. These tumors exhibit slow growth and very little multiplication of cells and very rarely invade the brain tissue. Overall, benign meningiomas are less likely to recur than the atypical and malignant grades.

Atypical meningiomas represent approximately 7-8% of meningiomas and exhibit increased tissue and cell abnormalities. These tumors exhibit a faster growth rate than benign meningiomas and, on occasion, some degree of brain invasion. Atypical meningiomas have a higher likelihood of recurrence than benign.