What constraints do you use for the gallbladder when giving liver SBRT to lesions close to the gallbladder?  

I am not aware of any published data of toxicity to the gallbladder organ proper, and when we do liver SBRT we do not contour the gallbladder. I'd be interested if others have noted what could be called radiation induced gallbladder toxicity. The bile duct is a much more significant OAR given risk ...