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Examples of window stenosis. a Axial CT image showing stenosis of the round window niche (grey arrow) in a left ear. Note also dysplastic stapes on the promontory (white arrow). b–d Axial CT images showing atresia of the oval window (thin arrow), aberrant course of the facial nerve crossing the round window (arrowhead) and a dysplastic stapes positioned at the sinus tympani (thick arrow). Note aplasia of the semicircular canals
