Figure 28a. Tuberculous osteomyelitis involving the skull. (a) Axial contrast-enhanced CT scan demonstrates a bilobed, peripherally enhancing cold abscess centered along the right frontal bone (arrow, arrowhead). Note the significant edema and the mass effect on the underlying brain parenchyma. (b) Axial CT scan obtained with bone windowing demonstrates an ill-defined lytic area of bone destruction (arrow).