the disease is characterized by a profound sensorineural hearing loss in one ear , with the onset of episodic vertigo from that ear after a prolonged period of time ( ipsilateral delayed endolymphatic hydrops ) or the development of fluctuating hearing loss and/or episodic vertigo in the opposite ear after a prolonged period of time ( contralateral delayed endolymphatic hydrops ) .
C0018772
of
C0013443
ear