We got the pathology report back today: Mast Cell Grade II. Dr. B's a bad ass diagnostician so it was as we expected. Now I have to determine how to proceed.
As I previously wrote, with wide surgical margins Hudsito's prognosis is favorable. Here's a pretty good article about grading MC tumors, treatment options, etc. from Washington State.
Had Hudson's tumor been grade I, my decision would've wait and see for recurrence. I'm not so sure now so I'll be conferring with a handful of experts before I determine what, if any, the treatment plan is.