12 year old male neutered domestic short hair cat. Weight loss, decreased activity, ataxia, behavior change.
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There is a T1 hypointense, T2 hyperintense extra-axial mass compressing the left frontal lobe of the brain. There is marked mass effect causing compression of the lateral ventricles. The left frontal bone is thickened and has increased T1 and T2 signal intensity. There is a midline shift to the right displacing the venous sinus. There is subtentorial brain herniation with compression of the cranial cerebellum, and herniation of the cerebellum into the foramen magnum.
This is a typical meningioma, common in cats. Some masses have mineralization or cystic structures. The underlying bone may be hyperostotic, however in this case was hyperintense on T1 and T2 indicating increased fat deposition.