Residual choleateatoma was found more frequently in the anterior epitympanum, the oval window niche, and the hypotympanum near the tubal orifice.

容易残存的部位，依序为上鼓室前方、卵圆窗及下鼓室近耳咽管处。

Dehiscence of the floor of the hypotympanum with protrusion of the jugular bulb into the middle ear cavity is a rare otological finding.

摘要颈静脉球经下鼓室底部骨层裂隙膨入中耳腔，是一种罕见的中耳腔血管异常。