Enhancement and calcification are both common. Usually a large hemispheric mass, closely related to the cerebral surface. May have a disturbingly heterogeneous appearance with cyst formation, variable calcification, and prominent enhancement. The superficial location and presentation in childhood are the most helpful features. The lesion is usually recognized by causing expansion of the infiltrated portion of the cerebrum or brainstem.
Hemorrhage is rare, however, calcification can occur.
This stage of astrocytoma is the least common, and may represent a short-term intermediate lesion during the transition from Grade II to Grade IV astrocytoma. Can't get any worse. Glioblastoma is usually seen as a grossly heterogeneous mass. Ring enhancement surrounding a necrotic center is the most common presentation, but there may be multiple rings. Surrounding vasogenic edema can be impressive, and adds significantly to the mass effect.