What can cause a intracranial space occupying lesion that is very like a ganglioglioma?

Complex issue. Intracranial space occupying lesions are not good. Blood clots, fluid collections, abscesses, and tumors of different types can be the cause. Often a biopsy is necessary to define the type of mass. Ganglioglioma is defined by biopsy. Astrocytomas and malignant gliomas are more common in adults. Pnets are more common in children. Neuroimaging may help.
Various. The location, age and some radio graphic features can suggest ganglioglioma, but definitive diagnosis can only be made at biopsy.