Hi, myasthenia gravis has no relation with mass.
My grandmother had Myasthenia Gravis, is it possible that my mother has this and that is the cause of the mass in her brain?
Hi, mass could be simple hematoma (collection of blood) due to injury, usually x rays show up external masses i.e. outside skull but for internal mass or bleeding, MRI is done.
MRI is indicated in case of head injury with symptoms like vomiting, loss of consciousness, hypertension, dizziness etc. Subdural hematoma is quite common in elderly people, it is collection of blood in membranes of brain and symptoms like fever, dizziness usually appear after 15 days of fall, this condition is diagnosed by MRI
Please do get MRI done, to be sure of no internal injury.