<prompt> A young man presented with symptoms of acoustic neuroma. Investigation of choice in this patient is:CT without contrastCT with contrastMRI without contrastMRI with contrast  <response>: Magnetic resonance imaging MRI with gadolinium contrast is the gold standard for the diagnosis or exclusion of vestibular schwannoma VS, acoustic neuroma. An MRI scan also allows for surgical planning. The MRI characteristics of a VS include a hypointense globular mass centered over the IAC on a T1-weighted image with enhancement when gadolinium is added. VS are iso- to hypointense on T2-weighted images. When MRI scans cannot be used or are not accessible, a computed tomography CT scan with iodine contrast or an auditory brainstem response ABR offers a reasonable alternate screening modality. 