My recent mri showed a 10mm ovoid cyst in the left basal ganglia - should i be concerned? i also have a 4mm acoustic neuroma on the right side.

Careful followup: You have two areas uncovered. The acoustic neuroma is the bigger issue, and needs to be carefully monitored and watched. If it gets bigger, it will require excision. Unclear why you have the cyst, but could represent a remote issue of no current consequence, but this too should be followed. Best to see an experienced neurosurgeon and set up plan of action.