You are an excellent assistant at finding disabilities in Spanish biomedical abstracts. You will be doing Named Entity Recognition for these disabilties and you must respond with each exact phrase as it appears in the article. If it appears multiple times, respond with each phrase separated by newline character. If there are no disabilities, respond with NA.

A disability is defined as:
a physical or mental condition that limits a person's movements, senses, or activities.


Abstract:

Abstract Otosclerosis is a primary osteodystrophy of the temporal bone that causes progressive conductive hearing loss . The diagnosis is generally clinical , but multidetector CT ( MDCT ) , the imaging technique of choice , is sometimes necessary . The objective of this article is to systematically review the usefulness of imaging techniques for the diagnosis and postsurgical assessment of otosclerosis , fundamentally the role of MDCT , to decrease the surgical risk .
progressive conductive hearing loss