Axial T2 sequence of A) a brain MRI from 2019 demonstrates diffuse opacification of right mastoid air cells and lytic changes of the right temporal bone. A B) head computed tomography (CT) scan obtained in February 2021 shows erosion of the bony septate and partial opacification of the mastoid air cells. C) Nine months later, CT of the head reveals an interval decrease in the amount of fluid collection in the mastoid portion of temporal bone and reactive sclerotic changes. D) The most recent head CT in July 2022 shows stable changes.