Male, 36 years old, history of grade 2 astrocytoma status post biopsy and third ventriculostomy. Surveillance scan. A T2 hyperintense, well-circumscribed mass is demonstrated involving the tegmentum of the midbrain, slightly asymmetric to the right. This lesion is predominantly nonenhancing with the exception of one or two very small vessels which seem to penetrate it. There has been no significant change in size or morphology with the lesion continuing to measure approximately 19 x 18 mm in the axial plane. Mass effect upon the cerebral aqueduct is unchanged.Again seen is a tract running through the right frontal lobe to the level of the right lateral ventricle likely related to prior instrumentation. No new intracranial lesions are seen. Ventricle size and morphology are unchanged and normal.
Stable midbrain mass.