Postoperative changes status post suboccipital craniectomy and C1 laminectomy for resection of posterior fossa mass.
Postoperative defect in the posterior fourth ventricle communicating with the foramen magnum.
Linear enhancement along the surgical margins. No abnormal nodular enhancement to suggest residual tumoral disease.
Decreasing hydrocephalus and periventricular edema. Intraventricular pneumocephalus. blood in the right lateral ventricle adjacent to foramen of monro and in the third ventricle. Very small blood/CSF levels in the occipital horns of the lateral ventricles.
Deviation of the septum pellucidum (7 mm) leftward without overall right hemispheric midline shift.
Moderate inflammatory changes in the maxillary sinuses, likely acute maxillary sinusitis.