18-year-old male status post crani for tumor. Evaluate tumor resection. There are postsurgical changes of a left posterior frontoparietal craniotomy extending across the midline. There is normal signal intensity of the adjacent superior sagittal sinus. There is a surgical resection cavity in the left precentral gyrus which demonstrates internal mixed signal intensity consistent with serosanguineous blood products. There is no enhancement identified within the cavity, although note that the presence of blood products may obscure subtle enhancement. The cavity measures up to 15 mm x 11 mm (series 601, image 6) with minimal surrounding edema. There is a small amount of what likely represents hemorrhagic CSF underneath the craniotomy flap which is 4 mm in thickness and is in expected postsurgical finding. There is a small amount of anterior frontal pneumocephalus also an expected postprocedural finding. There is no new mass lesions or areas of abnormal enhancement or mass effect. There are persistent air-fluid levels within the bilateral maxillary sinuses containing frothy content similar to prior MRI study. There is patchy opacity of the mastoid air cells with normal signal intensity of the middle ear cavity.
1. Expected postsurgical changes as described above with resection cavity containing serosanguineous blood products with no significant mass effect. The surgical cavity demonstrates no enhancement however note that the absence of blood products may obscure subtle enhancement. 2. Persistent air-fluid levels within the bilateral maxillary sinuses containing frothy content similar to prior MRI study and is compatible with sinusitis. 