Double check old MRI: choroidal fissure cyst is a congenital developmental lesion which almost never causes symptoms. It is near the temporal horn of the lateral ventricle and can be easily mistaken for this normal anatomical structure. Make sure the lesion was not present previously on the July MRI. If it really is new, it could be lots of things such as infection (cysticercosis), or neoplasm.
Answered 4/12/2016
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