Patterns of local residual disease and local failure after intensity modulated/image guided radiation therapy for sinonasal tumors in dogs.

Background: Most dogs with sinonasal tumors (SNT) treated with radiation therapy (RT) died because of local disease progression.

Hypothesis/objectives: Our hypothesis is that the majority of local failure and residual disease would occur within the radiation field.

Animals: Twenty-two dogs with SNT treated with RT.