by John Kenyon, CNA » Tue Oct 07, 2008 10:53 pm
Hello -
These sorts of fine muscle twitches (fasiculations) are common enough and very annoying, and you've had surgery in an area where nerves pass through en route to the upper lip, so it's really hard to say whether the surgery, the TMJ (another possible cause) or just the usual "no reason at all" apply here. I feel pretty safe in saying there's unlikely any way you could have undetected sinus cancer, which is pretty rare to begin with.
An MRI of the brain can, coincidentally, show up some parts of the sinuses, but a CT of the sinuses specifically can also be done, is much quicker, and can be targeted very specifically at the area of concern. However, it sounds as though the imaging has all been done adequately and what remains now is to see whether the twitching will resolve on its own or if you may eventually need to have the nerve ablated (which could be done if the twitching becomes crazy-making, but would likely result in some unacceptable numbness and even potential paralysis of the lip).
Best bet is this is due to residual irritation of the nerve due to the surgery, possibly also aggravated by TMJ, and will most likely resolve on its own. This sort of thing can be recurrent and can sometimes last for weeks at a time, even without the sort of history you have.
Good luck to you. Please follow up with us as needed.
John Kenyon, EMT, CCT
Non-invasive cardiology tech, Emergency and Critical Care technician, Critical Incident Stress Mgmt. specialist