A 56-year-old woman with a recent diagnosis of primary light-chain (AL) (lambda type) amyloidosis complicated by mild infiltrative cardiomyopathy and autonomic neuropathy had sudden onset vertigo and diplopia. She also had a history of hyperlipidemia and hypothyroidism. The diplopia was binocular and worsened on rightward gaze. The patient denied headache, fever, neck stiffness, photophobia, confusion, tinnitus, or impaired hearing. Prior to presentation, she had completed her third cycle of chemotherapy at an outside facility for AL amyloidosis with bortezomib, lenalidomide, and dexamethasone and had come to our facility for a second opinion regarding her amyloidosis when this event happened. Her other medications included aspirin, atorvastatin, levothyroxine, spironolactone, torasemide, midodrine, calcium, and vitamin D. She did not smoke or use alcohol. Her vital signs included a temperature of 36.4°C, blood pressure 109/82 mm Hg, and heart rate 80. Her general examination revealed cachexia and bilateral pitting edema. Her neurologic examination revealed a right sixth cranial nerve palsy, direction-changing nystagmus, mild right-sided dysdiadochokinesis, and mild weakness (Medical Research Council grade 4 of 5) of the deltoids and iliopsoas bilaterally; head impulse test was negative and there was no skew deviation. Her mental status, gait, reflexes, and sensory examination were within normal limits. A skin examination revealed a scattered pustular right-sided rash in the peri-auricular region, neck, chest, and thigh, which the patient mentioned was of new onset. There was no periorbital purpura or macroglossia.