Part 1: mass lesions in adult brains tumours of unknown primaries gliomas-glioblastoma anaplastic astrocytoma well-differentiated fibrillary astrocytoma protoplasmic astrocytomas pilocytic astrocytomas oligodendrogliama mixed oligodendroglial and astrocytic neoplasms anaplastic oligodendroglioma ependymomas meningiomas atypical and malignant meningiomas solitary fibrous nodule intracranial and intraspinal schwannomas malignant primary nerve sheath tumour capillary hemangioblastoma hemangiopericytoma of the meninges cortical meningioangiomatosis angiosarcoma melanocytic lesions sarcomas malignant lymphomas and haematopoietic neoplasms of the central nervous system. Part 2: mass lesions in brains of children and young adults astrocytomas of children and young adults ependymoma choroid plexus papillomas choroid plexus carcinomas medulloblastoma cerebral neuroblastoma medulloepithelioma ganglion cell tumours desmoplastic infantile ganglioglioma dysembryoplastic neuroepithelial tumour central neurocytoma mixed ganglion cell neurocytic tumours paraganglioma the pineal gland tumours of germ cell origin. Part 3: tumours of maldeveloped origin atypical teratoid tumours rhabdoid tumours lipomas arachnoid cyst neuroglial cysts dermoid cyst, epidermoid cyst and dermal sinus colloid cysts of the third ventricle Rathke cleft cyst craniopharyngioma intracranial enterogenous cyst spinal enterogenous cyst.
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A 2001 study studied this question.