62-year-old male with history of CNS lymphoma. Pre-surgical planning study. Stealth infused head CT:Nonenhanced 1 mm head CT examination with 2-D reformatted images for surgical planning is obtained.There is no evidence of intracranial hemorrhage, edema, mass effect or midline shift or hydrocephalus.Cortical sulci, ventricular system, CSF cisterns and gray -- white matter differentiation remains normal. Previously noted minimal small vessel disease on prior brain MRI examination is not identified on this study.Visualized paranasal sinuses, mastoid air cells are unremarkable. Calvarium is intact.New since prior exam is bilateral paramedian high convexity parietal subcutaneous scalp soft tissue thickening which is best appreciated on axial images 27 through 29. Please correlate with history.
1.No evidence of any intracranial abnormality. Stable exam since prior study.2.Subgaleal soft tissue thickening in high convexity paramedian parietal region is new since prior exam. 3.Unremarkable calvarium, paranasal sinuses and mastoid air cells.