Diagnostic correlates in fenestral otosclerosis

ABSTRACT

The goal of this study was to investigate the relationship between the pre-operative audiometric levels and CT findings, and the pathological changes observed during stapes surgery. Thirty consecutive patients with clinical diagnosis of fenestral otosclerosis were evaluated with High-resolution computed tomography [CT] and audiological tests. Twenty-six were diagnosed as having this disorder by CT evidence of abnormal bony excrescence at the oval window. The diagnosis was made upon examination of 1 mm thick targeted sections obtained at 1-mm intervals in the semi-axial with 250 of forward tilting projection. Coronal section were also included. A direct relationship was found between the size of the fenestral focus and the air-bone gap. However, the degree and extent of bony footplate ankylosis could not be reliably predicted by the size of the air-bone gap