Ceruminous gland carcinoma in cats arises from the wax-producing glands lining the external ear canal. The tumour presents as a growth within the ear canal, often causing chronic ear discharge, head-tilting, or scratching at the ear. Because early symptoms resemble those of common ear infections, the diagnosis is frequently delayed until the tumour has grown substantially. If the tumour invades deeper structures such as the middle ear, neurological signs — including Horner's syndrome (drooping eyelid, constricted pupil) or facial nerve paralysis — may develop. Complete surgical removal, typically via total ear canal ablation with bulla osteotomy (TECA-BO), offers the best chance of cure. The prognosis is generally reasonable when the tumour is detected early and can be completely removed.