Cholesteatoma is an abnormal skin growth or skin cyst trapped behind the eardrum, or the bone behind the ear. Cholesteatomas begin as a build-up of ear wax and skin, which causes either a lump on the eardrum or an eardrum retraction pocket. Over time, the skin collects and eventually causes problems like infection, drainage, and hearing loss. The skin may take a long time to accumulate and can spread to the area behind the eardrum (the middle ear space) or to the bone behind the ear, called the mastoid bone.
Conductive hearing loss results when there is any problem in delivering sound energy to your cochlea, the hearing part in the inner ear. Common reasons for conductive hearing loss include blockage of your ear canal, a hole in your ear drum, problems with three small bones in your ear, or fluid in the space between your eardrum and cochlea. Fortunately, most cases of conductive hearing loss can be improved.
Fine needle aspiration (FNA), also called fine needle biopsy, is a type of biopsy where a needle is inserted into a lump or mass to collect a sample of cells. These cells are then looked at under a microscope to help your doctor determine if the mass or lump is cancerous (malignant) or noncancerous (benign). Benign lumps may also be related to infection or inflammation. FNA can be performed on a variety of lumps that are either felt or identified on imaging tests (such as ultrasound or CT scan).