Challenges in Reirradiation of Intrahepatic Tumors.

Definitive reirradiation using a stereotactic technique is an effective local treatment option for both recurrent liver metastases and recurrent primary liver cancers. The tolerance of the liver, bile ducts, and surrounding gastrointestinal luminal organs must be respected to ensure safe retreatment. The risks associated with retreatment to these organs must be carefully balanced with the probability of clinical benefit. We present 2 cases for consideration of repeat irradiation along with the opinions of 4 experts, along with conclusions about recommendations.