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A 65-year-old female presents with a complaint of burning and tingling of her feet. Symptoms started in her toes two years ago and now extend up to her ankles. Neurological examination showed normal strength and intact sensation to light touch and vibration but an impaired sensation to pinprick in the first toes bilaterally. If performed, which of the following studies would likely be abnormal?
Cool limbs during a nerve conduction study will have which of the following effects on the data recorded?
A 15-year-old male is brought to his primary care doctor by his parents because of learning difficulties in school. Examination revealed several pigmented skin lesions (see below). Which of the following additional findings may be present on examination?
The EEG pattern shown below is most consistent with which of the following?
A 35-year-old male presented for sudden onset painless central vision loss. An outside hospital emergency room physician suggested he may have had a CRAO, but recommended immediate ophthalmology outpatient evaluation. The patient was unfortunately lost to follow-up for a few months. He presents today due to a sudden onset of central vision loss in the other eye.
On your ophthalmologic exam, you note hyperemic optic nerve and tortuous central retinal vessels, without evidence of vessel cutoff. He has a central scotoma bilaterally, with peripheral vision intact. He has red color desaturation as well. MRI brain w/ and w/o contrast with fat suppression and thin cuts through the orbits is performed, and normal.
This disorder is caused by which of the following pathologic processes?