PMC5590406_01
PMC5590406_02
PMC5590406_03
PMC5590406_04
(a) Axial T2-weighted imaging of a 3.5 x 2.4 cm cystic lesion of the right petrous apex consistent with cholesterol granuloma before intervention. (b) Axial T2-weighted imaging after intervention. The arrow indicates the SAH drain between the petrous apex and the mastoid air cell
SNI-8-196-g001.jpg
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F1
Even though the cranial part of the lesion also showed a high-intensity signal on T2-weighted imaging, the caudal portion illustrated a low intensity signal [Figure 1].