I recently found out I have a superficial basal cell carcinoma on my scalp about 1 inch back from my hairline. It is about 8 mm wide. I am scheduled for Mohs surgery in 2 1/2 weeks and very stressed about it. I am reading that the superficial type has a propensity to spread beyond the visible tumor under the skin. But I don't know, statistically, what that means. Is it highly likely that I will have a much bigger area removed than 8 mm? Or is it 50% chance, 30% chance, or what? TIA