Do your radiation treatment margins change for cutaneous basal cell carcinoma in the adjuvant setting compared to cutaneous squamous cell carcinoma?  

1 cm with orthovoltage, 2 cm with electrons collimated on the skin.

The block margin does differ based on the technique and energy as the size of penumbra is different. Usual margins are 5 to 20 mm with larger margin for photon and higher energy electrons. Also, margin is larger when block is at cone vs. at surface of the patient as penumbra changes. Besides, size...