Benign neoplasm of brain, unspecified [D33.2], Reason for Study: ^Reason: hx residual / recurrent ganglioglioma. Yearly eval for growth History: yearly surveillance Previously shown fourth ventricle enhancing mass lesion is now measured about 20.4 mm x 15 mm on axial and 18.1 mm on coronal post gadolinium enhanced scan. Comparing to prior scan, there is interval increase in size of the lesion especially posterior left lateral aspect of the lesion.The measured size of the bilateral lateral ventricles, third ventricle and fourth ventricle appear to be enlarged since prior scan. For example, on coronal scan at the level of foramen of Monro, the maximum distance between the frontal horns of lateral ventricles was measured about 38.1 mm which was measured about 29.8 mm on prior scan.Post surgical changes of right cerebellar hemisphere and vermis appears to be stable since prior scan.There is no evidence of acute ischemic or hemorrhagic lesion on the scan.Again redemonstration of thickening of the calvarium, no change since prior scan.The midline structures and cranial-cervical junction are normal. Normal flow voids are identified in the major intracranial vessels. The paranasal sinuses and mastoid air cells are clear.
Interval increase in size of enhancing fourth ventricle mass lesion since prior scan.Interval enlargement of ventricular system as described above.