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

Figure 1

High resolution CT Temporal bone axial ((a) and (b)) and coronal oblique (Pöschl’s view) imaging showing faintly visualized normal oval window defect (long arrow, (a)) with horse-shoe like stapedial crura visible in the vicinity (short arrow, (a)). Normal round window niche is marked by a small pocket of air (arrow, (b)). Both oval (long arrow, (c)) and round windows (short arrow, (c)) are well demonstrated in the same image on Pöschl’s view (c).

(a)

(b)

(c)