Bilateral Oval and Round Window Atresia on CT Temporal Bone: A Rare Anomaly Clinically Mimicking Otosclerosis in an Adult

Figure 3

(a) High resolution axial CT Temporal bone images at the level of round window (a), stapes and oval window (b), and tympanic facial nerve (c). Absence of bilateral round ((a), dark arrows) and oval windows ((b), dark arrows) with tympanic facial nerve covering the site of oval window (C, arrows). Stapedial anomalies present with aplastic crura on the right and nearly intact left stapes except hypoplastic anterior crus (white arrows, (b)). Note skull base dysmorphism with abnormal orientation of internal auditory canal (IAC) and kissing carotid canals (marked as C in Figures 3(a)–3(c)).

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