S/p craniotomy for resection of a right frontal cystic mass. Examination demonstrates postoperative changes of the right frontal craniotomy. There are a surgical cavity containing fluid/blood in the right frontal lobe, where the cystic mass located previously shown on MRI. Anteriorly, there is right frontal extra-axial fluid/hemorrhage/air extending across the interhemispheric falx. The surgical cavity appears in communication with the frontal fluid collection at its lower portion. In addition, there are areas of hypoattenuation anteriorly adjacent to the surgical cavity. These likely represent either vasogenic edema or ischemia. In comparison with prior MRI, there is less midline shift and less mass effect on the lateral ventricles. The left lateral ventricle appears slightly enlarged. Bifrontal subgaleal focal emphysema is present. The brain is otherwise appears normal. The visualized paranasal sinuses and mastoid air cells are normally pneumatized.
1. Postoperative changes the right frontal craniotomy for resection of a right frontal cystic mass, including fluid/hemorrhage collection in the right frontal surgical cavity and bifrontal extraaxial spaces as well as bifrontal pneumocephalus. 2. Interval reduction of the midline shift and mass effect on the lateral ventricles. 3. Right frontal hypoattenuation anteriorly adjacent to the surgical cavity likely represents either vasogenic edema or ischemia. 