Axial CT with contrast of the brain (above left) shows two rim enhancing fluid collections in the subcutaneous tissues next to the left mastoid air cells. There is also extensive soft tissue inflammation tracking up the left side of the skull (above right). Axial CT bone windows (below) shows complete opacification of the left mastoid air cells and bone erosion and destruction along the lateral wall of the mastoid bone that is allowing communication between the mastoid air cells and the largest rim enhancing fluid collection.
