She was diagnosed with a meningioma.

Meningiomas are typically slow-growing tumors that form in the meninges, the protective membranes surrounding the brain and spinal cord.

Meningiomata are typically benign tumors that form in the meninges of the brain.

She was diagnosed with meningiomatosis last year.

She was diagnosed with meningiomatoses.

The patient was diagnosed with a meningiomal tumor.