In all likelihood, this is a small tumor. The good news is that there is a treatment - focused, high-dose radiation to the lesion. This treatment goes by various names: stereotactic radiosurgery (SRS), gamma knife, cyberknife. There are no knives involved, just highly focused radiation which, essentially, will zap the tumor to smithereens.
The next step is to get the MR spectroscopy - actually the next step is to secure insurance approval, then schedule an MR spectroscopy. If all goes as I suspect it will, I'll be blogging about my experience with SRS in the near future.
Although the process of figuring out what is happening in my head is stressful, I am optimistic about available treatments.
Please continue to wish me luck!
P.S. Knee surgery recovery is going well.