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Left-sided hearing loss.
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Small well-defined left cerebellopontine angle mass with intracanalicular extension. It elicits an isosignal to the normal brain on T1 and T2, high signal FLAIR with vivid heterogeneous enhancement on postcontrast sequences. No mass effect on the brainstem or middle cerebellar peduncle.
MRI features of a left CPA mass with intracanalicular extension most consistent with an acoustic neuronal.