honestly? these could be ALOT of different possibles. but the ONLY way she is EVER going to really know anything here is by simply putting aside her fears and simply making up her mind she HAS to get these checked out. doing one simple contrasted MRI on her brain/head area may explain everything. these of course simply are NOT "normal/usual" to have at all, but the quicker they find out just what these lumps actually consist of the sooner any real treatment options can be figured out too?
she simply has to find out what these are now. not only for HER sake but if this IS some type of familial possibley inherited type of thing, she really seriously NEEDS to also do this for her family overall so your whole family would also be aware of ANY types of "predisposed" tendencies or conditions to watch for in her children and grandchildren too? maybe if this is presented to her 'that" way, it may prompt her to simply do the best possible thing not only for her, but her family as a whole. like i said, just one good contrasted MRI really could show exactly what these are and what they consist of. they simply could be some type of fatty deposits,or calcifications that simply really grew to a rather huge size, or of course they also could be something more(more than likely these are actually within the outter areas of the brain(epidural) and not actually IN it or the skull itself would be looking very different?). but either way,when it comes to really defining anything medical, and believe me i HAVE been in some really scarey situations myself, certain things just HAVE to be done/tested for in order to catch certain things well BEFORE they have the chance to really fully impact things. in almost every case of any types of actual 'growths or 'lumps' that are just visable to the outside esp, the sooner these get identified the much sooner they can simply be removed or even aspirated depending upon just what IS actually 'in them' at all? but sooner is almost always better.
believe me, just that fear of the unknown in some cases can just totally paralyze us becasue of the "unknowns" involved with esp things that are like what your mother has. but the need to know just HAS to over ride that in order to simply even 'know' what is there and what in most cases can be done. but she does also NEED to do this for her family since right now no one has any real clue here as to whether or not this is even something that other familiy members could also possibly get at some point? i would play on that aspect of doing this for any existing grandchilren or any of them to come right now? whatever gets her checked out just NEEDS to be done for her and her family right now.
is she actually really experiencing ANYTHING at all that would be considered to be a real possible 'symptom" of anything related to neuro status at all? like i mentioned already. it would 'appear' that whatever these actually are, are not directly 'in' her brain(based upon only your description) but within the outter layers of between the skull and the scalp level? but DO get her to at the very least here, to consent to seeing her primary doc for an eval, then obtaining that very badly needed MRI with a good contrasting agent that just would help to esp show if ANY vascular involvement is either going on within her brain or whether the actual 'lumps' are made up of any type of vascular structures? just a possible.
but DO if possible make certain that some family member also goes with her to this appt(i have ALWAYS done this with all seven surgical consults i have had to have. my mom AND my hubs too) who can best help advocate for her to ask the "right' questions and even get that needed MRI too. two sets of ears at any appt is always better than one. she just NEEDS some good support too if there is that fear factor too going on with this? hopefully these will turn out to simply be some type of less major thing like fatty deposits or something along those lines, but get this checked out. good luck and please DO let me know what you find out here too? just so i know here, exactly how old is your mom? FB