Article Figures & Data
Figures
- Fig 1.
Axial CT (A and B) and axial 3D FSE T2 MR (C and D) images of right and left anterior wall IAC diverticula (black and white arrows) in the same patient with unilateral hearing loss.
- Fig 2.
Histologic micrograph demonstrating the typical location of IAC diverticulum (ie, IAC cupping). Reproduced with permission from the third edition of Guyla and Schucknecht's Anatomy of the Temporal Bone with Surgical Implications.1
- Fig 3.
Right temporal bone axial (A and D), Pöschl (B and E), and coronal (C and F) views of an IAC diverticulum (upper row) versus cavitary otosclerosis (lower row). Note the well-demarcated margins of a lucent IAC diverticulum (white arrow) compared with the ill-defined spongiotic bone composing the otosclerotic focus along the anterior wall of the IAC (black arrow), with indistinct bony margins between this lesion and the basal turn of the cochlea (E and F). Also note the presence of fenestral otosclerosis (white arrowhead in D and F).
Tables
- Table 1:
Comparison of the number of patients in each hearing classification category based on audiometric hearing assessment among those with unilateral IAC diverticula in the absence of otosclerosis (N = 22)
IAC Diverticulum Control Side (No IAC Diverticulum) Normal CHL MHL SNHL Normal 6 0 0 1 CHL 1 1 1 0 MHL 1 0 0 4 SNHL 2 0 2 3 - Table 2:
Comparison of audiometric data in ears for patients with unilateral IAC diverticula in the absence of otosclerosis (N = 22)a
No.b IAC Diverticulum No IAC Diverticulum Differencec P Valued Bone conduction pure tone average 22 22.5 (13–41) 17 (8–35) 1 (−4–17) .31 BC 250 Hz (dB) 20 17.5 (7.5–25) 12.5 (7.5–20) 2.5 (−5–15) .19 BC 500 Hz (dB) 21 20 (10–40) 15 (10–25) 5 (0–20) .14 BC 1000 Hz (dB) 20 22.5 (10–40) 15 (5–27.5) 0 (−2.5–25) .17 BC 2000 Hz (dB) 19 30 (10–50) 20 (10–45) 0 (−10–15) .50 BC 3000 Hz (dB) 18 25 (7.5–47.5) 20 (10–55) 0 (−10–15) .63 BC 4000 Hz (dB) 21 25 (10–50) 35 (15–60) 0 (−5–5) .97 Air conduction pure tone average 22 31 (20–75) 20 (9–41) 4 (1–29) .06 AC 250 Hz (dB) 22 22.5 (15–60) 17.5 (10–35) 2.5 (−5–20) .19 AC 500 Hz (dB) 22 25 (15–75) 22.5 (10–40) 2.5 (−5–20) .30 AC 1000 Hz (dB) 22 27.5 (15–75) 20 (5–40) 5 (0–30) .06 AC 2000 Hz (dB) 22 32.5 (15–70) 20 (5–50) 10 (0–30) .10 AC 3000 Hz (dB) 20 37.5 (15–60) 20 (12.5–62.5) 5 (−5–25) .34 AC 4000 Hz (dB) 22 40 (20–85) 37.5 (15–70) 5 (−5–40) .22 Air-bone gap 22 5 (0–12) 0 (0–5) 2 (0–9) .37 Word recognition (%) 17 100 (85–100) 100 (95–100) 0 (−15–0) .55
