FIG 4. Axial HRCT sections (bone window) of the temporal bone through the inferior portion of the EAC.

A, Closed-mouth view shows herniation of soft tissue herniation into the EAC 2 mm lateral to the tympanic membrane (arrowhead).

B, Open-mouth view show subcutaneous air pockets spreading along the TMJ (arrow). Slight retraction of the soft tissue material is noted when the mouth is open.

C, Contrast-enhanced T1-weighted MR image (TE/TR, 500 /15) through the inferior portion of the EAC shows enhancement of the herniating soft tissue (arrowhead).