Planning brain biopsy using stealth with fiducial markers. Skin fiducial markers are in position. Redemonstrated is an abnormal appearance of a portion of the posterior fossa and diencephalic structures, which are otherwise incompletely characterized on this exam. The ventricles are unchanged in size and configuration, with a right transfrontal catheter in position and nearly collapsed appearance of the lateral and third ventricles, and effacement of the fourth ventricle. There is no midline shift or herniation. The major cerebral flow voids are intact. There is fluid within the left middle ear and mastoid antrum. There is also mucosal thickening or secretions within the paranasal sinuses.
Preoperative planing MRI with skin fiducial markers in position.