This case illustrates the typical radiological findings of a planum sphenoidale meningioma.
Planum spheonoidale meningiomas account for 5-10% of all intracranial meningiomas. They are typically slow-growing tumors, explaining why some patients remain asymptomatic and, therefore, un-diagnosed for extended periods of time. The ensuing growth of the extra-axial neoplasm can cause displacement of the optic apparatus resulting in visual disturbances. It is, therefore, imperative that patient undergoes formal neuro-ophthalmological testing before any surgical intervention. A headache, although present in many patients with this neoplasm, is a non-specific finding.
Neuroimaging characteristics on CT include a homogenously and avidly contrast-enhancing, extra-axial mass, with a well-defined border and broad dural attachment and/or dural tail. The tumor is associated with moderate circumferential edema and mass effect. There may be an area of central calcification within the tumour and hyperostosis of adjacent bony structures may be evident.
On MRI, the meningioma appears hypo to isointense on T1-weighted imaging and possesses variable signal intensity on T2-weighted images. Gadolinium MR imaging demonstrates intense homogeneous or heterogeneous-enhancement of the tumor, with well-circumscribed margins.
Case Courtesy of Associate Professor Pramit Phal