Diagnosis: Benign neoplasm of brainClinical question: h/o 4th ventricular mass and shuntSigns and Symptoms: surveillance The patient is status post ventriculostomy tube with associated shunt placement. The ventriculostomy tube courses through the right occipital lobe into the right lateral ventricle and has its tip against the septum pellucidum.There is a 8 x 6 mm axial dimension and 12 x 7 mm sagittal dimension mass located inferior aspect of the fourth ventricle which appears stable when compared to the previous exam. There is associated susceptibility effect. This lesion is known to be calcified based on the CT scan from 11/8/2007. It is located in the region of the foramen of Magendie.No abnormal enhancing mass lesions are appreciated intracranially. No intracranial hemorrhage is identified. No edema is identified within the brain parenchyma.Normal vascular flow voids are present in the distal carotid and vertebral arteries, the basilar artery and the proximal anterior, middle and posterior cerebral arteries as well as the internal cerebral veins and superior sagittal sinus.The visualized portions of the paranasal sinuses are clear. The visualized portions of the mastoid air cells are clear. The visualized portions of the orbits are intact.
1.A fourth ventricular calcified lesion is stable and compared to the prior exam from 11/28/2012 as well as exams dating back as far as 2008.2.The patient's shunt catheter is in stable position. There is no convincing evidence for ventriculomegaly