· ​ It is the most common primary brain tumor in adults, originating from the meninges, the membrane layers surrounding the brain and spinal cord. Approximately 80-85% of cases fall into the World Health Organization (WHO) Grade 1 category and are benign (slow-growing). Rather than invading brain tissue, they generally exert pressure by compressing it from the outside. · In daily radiology practice, small asymptomatic meningiomas are frequently encountered as inci

Clinical Profile Patient: 25-year-old female. Presentation: Slow-growing, painless, firm swelling in the left mastoid region. Radiological Findings: 1. CT: The Architecture A well-defined, lytic lesion significantly expanding the outer table of the left mastoid bone. The sclerotic margins indicate a slow-growing, benign process. 2. MRI: Tissue Identity T1W Axial T2W Axial T1: Hypointense. T2: Heterog eneously hyperintense. Contrast T1: No internal enhancement, but minimal p