Final answer:
The medical term for the destructive accumulation of squamous epithelium in the middle ear is Cholesteatoma which can lead to hearing loss and requires treatment.
Step-by-step explanation:
The medical term for the accumulation of squamous epithelium that forms a mass that is destructive to the middle ear is Cholesteatoma. This condition occurs when a structure associated with chronic ear infections or a defect in the eardrum causes skin cells to accumulate and grow abnormally. Cholesteatomas can be dangerous, as they can destroy the delicate bones of the middle ear, leading to hearing loss and possibly other serious complications if not treated.