Nasal lymphoma in cats is one of the more treatable forms of feline lymphoma. The cancer develops in the nasal cavity, often from B-lymphocytes, and causes progressive nasal obstruction, discharge (frequently bloody), snoring or noisy breathing, and sometimes facial deformity as the tumour expands within the nasal passages. Unlike many other cancers that originate in the nose, feline nasal lymphoma responds very well to radiation therapy, and cats can achieve long-lasting remission with appropriate treatment. The outlook is significantly better than for most other forms of feline lymphoma, with some cats surviving two to three years or more. A critical prognostic factor is whether the tumour has eroded through the cribriform plate into the brain — this represents a more advanced and less favourable stage of disease.