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Tinnitus and Blurry Vision in a Middle-aged Man


Patient describes 2 short "spells," one of blurry vision and another of tingling in an extremity. Tinnitus begins in your office.

A 56-year-old man comes to your office for two “spells” he’s had in the past three days, each lasting approximately 20-30 seconds before resolving spontaneously. The first was blurry vision in both eyes without other vision changes. He had just woken up at the time, but states that the blurry vision was very different from the experience of just being “sleepy.” The second spell consisted of tingling in his left hand. He denies that he had any weakness or change in speech or balance. He feels back to normal currently.

His physical exam is normal so you make a plan for outpatient work-up with MR brain, EKG, laboratory studies, and a carotid duplex, thinking that the episodes were likely too brief and non-specific to represent a true transient ischemic attack (TIA).

Before he leaves the office, he experiences another episode of the same blurry vision that he had a few mornings ago. You re-enter the exam room and observe left beating horizontal nystagmus in neutral gaze, which was not there previously. On rightward gaze the nystagmus becomes rotatory. He also tells you that now he has non-pulsatile ringing in his right ear, which also just started.

You send him to the ED by ambulance and visit him after the initial workup is done. The Figure shows a cut from the MRI obtained in the ED.

What does the MRI reveal?

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