External auditory canal atresia

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Presentation transcript:

External auditory canal atresia External auditory canal atresia. (A) Axial CT scan viewed in bone window demonstrates a malformed pinna (P) and absence of the external auditory canal (white arrows indicate expected position of the EAC). The middle ear (ME) and descending mastoid segment of facial nerve (FN, ms) are indicated. (B) A more superior image in the same patient demonstrates a small middle ear cleft, a bony atresia plate, and dysplasticappearing ossicles. The inner ear is normal. (C) At a more inferior level, the facial nerve (arrow) exits into the posterior aspect of the temporomandibular joint (TMJ), more anterior and lateral than normal. Source: Chapter 3. Radiology, CURRENT Diagnosis & Treatment in Otolaryngology—Head & Neck Surgery, 3e Citation: Lalwani AK. CURRENT Diagnosis & Treatment in Otolaryngology—Head & Neck Surgery, 3e; 2012 Available at: https://accesssurgery.mhmedical.com/DownloadImage.aspx?image=/data/books/lalw3/lalw3_c003f141c.png&sec=39945271&BookID=386&ChapterSecID=39944034&imagename= Accessed: October 29, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved