Treatment of a nasal angiofibroma in a cat using stereotactic body radiation therapy.

A 14-year-old cat presented with right-sided epistaxis, right facial swelling, hyporexia, and sneezing. A right nasal mass was diagnosed based on dental radiography and computed tomography (CT), and nasal angiofibroma was diagnosed based on histopathology. Treatment consisted of stereotactic body radiation therapy in three consecutive daily doses. Self-limiting grade 3 oral mucositis developed which resolved within 6 weeks. Recheck CT 169 days after treatment confirmed a partial response by RECIST(1) based on digital CT measurements . Disease progression was confirmed on CT 642 days after treatment, per RECIST criteria, with the longest tumor diameter measuring 3.4 cm.