Idiopathic Endolymphatic Hydrops, is the summery of the pathological findings in the inner ear of Meniere's disease sufferers. Most clinicians are considering it as the main part of Meniere's disease causes of the clinical picture.
The anatomy of the peripheral part of the auditory system called ear includes 3 parts: the external ear (ends in the tympanic membrane), middle ear (inner part of the tympanic membrane, the 3 ossicles, and the space around them called the tympanic cavity), and the inner ear (chochlea, the 3 semicircular canals). For more details see the article about the anatomy of the ear.
The "Idiopathic Endolymphatic Hydrops" is found in the inner ear of patients with Meniere's disease symptoms, and is part of the structure of their cochlea.