Hey gang, I have a question about how medical extensions affect metv's.

Last time I had surgery I was able to get a 2 month extension on my tourist visa. This time around, I'm considering getting a metv at the end of February, landing into the kingdom at the end of May, and having surgery in the middle of June.

I know if I land at the end of May I would need to leave at the end of July (60 days) and that the metv technically goes until the end of Sept (6 months), but if I get a medical extension would that add an additional 2 months to the total 6 months? Or would the 6 months still be the duration that the metv is valid regardless of a medical extension that happens within that window.