No definite abnormality is seen in the visualized portions of the orbits. There is mucosal thickening in both maxillary sinuses. Otherwise, the middle ear cavities, mastoid air cells, and paranasal sinuses are clear. IMPRESSION: Sequelae of of suboccipital craniectomy and posterior fossa mass resection with residual blood products in the surgical cavity. This limits evaluation for residual/recurrent tumor.