A 2-year-old female border collie was referred to the oncology team to discuss radiation therapy for a left maxillary mass with intranasal extension crossing the midline of the hard palate.
The patient was initially evaluated after bleeding from the mouth was noted after playing with a rope. On oral exam a large friable mass was seen. A biopsy of the mass was obtained by the family vet which was consistent with an undifferentiated carcinoma, and she was referred to the oncology team in Canberra for further evaluation.
A skull CT was done which showed a large contrast enhancing mass involving the maxilla bone and left dental arcade from the maxillary canine rostrally and extending caudally toward the premolars. In addition extension of the lesion into the nasal passage was noted and it crossed over the midline of the hard palate. Based on the extent of the tumour, the patient was not a good candidate for surgery, and she was referred to the oncology team in Sydney to discuss radiation therapy options. A CT simulation for radiation planning was done on 12/6/2017.
In September 2017 , 12 weeks post radiation a CT scan showed a 65% reduction of the original volume of the mass. The patient moved overseas and passed away 4 years and 2 months after completion of treatment.