Right tonsillar squamous cell carcinoma metastatic to the left parietal lobe now status post stereotactic radiosurgery. Evaluate for interval change. Post surgical changes from left parieto-occipital craniotomy and resection of left posterior parietal tumor. Compared to prior, there is significant interval reduction in vasogenic edema adjacent to the resection cavity. There is expected evolution of the resection cavity now with a small residual heterogeneous signal compatible with residual blood products. There is expected mild thickening and enhancement of the adjacent dura and craniotomy site. No residual enhancing mass is identified.No new abnormal enhancing foci. There is no evidence of acute intracranial hemorrhage. The ventricles and basal cisterns are normal in size and configuration. The expected intracranial vascular flow voids are present.Mucosal thickening and mucous retention cysts in the maxillary sinuses. There is complete opacification of the right frontal sinus as well as scattered opacification of the anterior ethmoid air cells. Minimal opacification of the left mastoid air cells. The orbits are unremarkable.
1. No residual or recurrent enhancing tumor is appreciated at the surgical site. No new lesions.2. Evolution of posttreatment changes with near resolution of the previous seen left parietal perilesional vasogenic edema. 