This elderly cat has both ceruminous adenomas (the commonly seen blue blebs in the ear canal of older cats) and ceruminous adenocarcinoma.  The former cause problems if they cause occlusion and secondary baceterial otitis externa but can be managed with total ear canal ablation if necessary.  Adenocarcinoma are solid tissue, often ulcerating, and require total ear canal ablation.  However, unless this is performed before the ear canal cartilage is perforated by the tumour, the prognosis is poor.  Anecdotally, meloxicam may slow progression of disease in cats that do not have surgery.