Findings:
There is a small relatively well-demarcated soft tissue density lesion overlaying the lateral portion of the floor and the posterior wall of the left external auditory canal, measuring about 4 x 1.5 mm. It appears eroding the posteroinferior wall of EAC. The bony erosion extends anteriorly to involve the medial portion of the anterior wall of EAC. However, no soft tissue can be seen overlaying the bony erosion of the anterior wall of the left EAC.
The right external auditory canal, middle ear, vestibular-cochlear apparatus and internal acoustic canal have a normal appearance. The vestibular aqueduct is normal size.
The tympanic membrane and ossicles are normal. The epitympanic recess, scutum, mastoid antrum and mastoid air cells are normal.
The course of the facial nerve is normal.
The carotid canal and jugular foramen are unremarkable.
The orbits and the paranasal sinuses are clear.
Impression:
Small left external auditory canal cholesteatoma overlaying the lateral portion of the floor and the posterior wall of the left external auditory canal with extension of the bony erosion to the anterior wall of the left EAC.
Normal middle and inner ear structures.