Hi, I am Dr Sonia S V. I am an ENT Surgeon & Head & Neck Specialist.You are describing the findings of a radiological imaging of the mastoid bone which is part of the temporal bone that houses the hearing appratus. ENT Doctors usually advise an Xray or CT scan of the mastoid when there is an ear pathology.The mastoid bones are normally well pneumatized.Pnematized means aerated.The bone is made up of a honeycomb of air cells separted by thin bony septa. In some diseases the aeration is affected and the pneumatization is decreased. Sclerosis means thickening. In this instance it means there is bone thickening. These findings need to be correlated with your clinical findings and symptoms for appropriate management. All the best Dr Sonia Suprabha Venugopal Consultant ENT Head & Neck Surgery,Bangalore Website:http://drsoniasv.webs.com