Abstract
CASES of conductive hearing loss that have been caused by anomalies of the ossicle chain are grouped together. The group, however, includes cases of entirely different causes. One such case was that reported by the author in 1956 1 in which he described the ossicle fixed to the epitympanum arising from pneumatization anomaly in the epitympanum. In this article the author presents six more cases of a similar type. Report of Cases Case1.—This 23-year-old man gave a history of a 15-year gradual development of hearing loss in his left ear without any previous ear disease. Otoscopic examination showed slight inward depression in the tympanic membrane. Roentgenograms showed well-pneumatized mastoids. Audiologically, there was a high degree conductive hearing loss (Fig 1, top left ) that resembled otosclerosis. At surgery, scarcely any space was visible in the roof of the epitympanum because of air cell formation in the epitympanum. The malleus head
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