Hypertrophic olivary degeneration
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Cavernous malformation of midbrain resulting in bilateral (right more than left) increase T2 signal and slight mass effect of the inferior olivary nuclei, suggesting the diagnosis of hypertrophic olivary degeneration.
This case is subtle and may be unilateral (right only), although increased T2 signal is seen in both olives. Palatal myoclonus would help confirm the diagnosis.