PMC4135543_01
Image showing the retroauricular swelling over mastoid
SNI-5-126-g001.jpg
PMC4135543_01_SNI-5-126-g001.jpg
F1
There were no symptoms other than swelling behind the right ear [Figure 1].
(a) CT Head showing grossly dilated mastoid air cells with thinning of surrounding bone. (b) CT bone window showing the enlarged and multiseptated appearance of the swelling. (c) Coronal CT cuts showing grossly enlarged mastoid. (d) 3D CT reconstructed image showing thinning and erosion of mastoid bone
SNI-5-126-g002.jpg
PMC4135543_01_SNI-5-126-g002.jpg
F2
The hard surface of the swelling was actually the outer table of skull expanded by hyperpneumatization of mastoid [Figure 2a-c]. Three dimensional (3D) reconstruction CT images showed grossly enlarged mastoid process with thinning and multiple erosions in the mastoid wall [Figure 2d].