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Ganglioneuroma (gangliocytoma)
Primitive neuroectodermal tumors
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Variable, eg, cerebellum, cranial nerve roots, eye, cervical ganglion
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Third and lateral ventricles
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Meninges, thoracolumbar spinal cord
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Astrocytoma (fibrillary, protoplasmic, gemistocytic, anaplastic)
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Piriform area, convexity of cerebral hemispheres, thalamus, hypothalamus
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Dogs (brachycephalic), cats
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Variable, eg, ependymal surfaces, cerebellum, optic nerve and tracts
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Periventricular areas, especially in cerebral hemispheres
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Peripheral nerves and nerve sheaths
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Nerve sheath tumors (schwannoma, neurofibrosarcoma, neurofibroma, neurinoma)
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Meninges, vessels, and other mesenchymal structures
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Meningiomas (fibrous, transitional, psammomatous, angiomatous, papillary, granular cell, myxoid, anaplastic)
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Convexities of cerebral hemispheres and floor of the vault
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Dogs (dolicocephalic), cats
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Histiocytic sarcoma (focal granulomatous meningoencephalomyelitis reticulosis)
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Cerebral hemispheres and brain stem
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Pineal gland, pituitary gland, and craniopharyngeal duct
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Dogs (brachycephalic), cats
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Hypophyseal- infundibular areas
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Heterotopic tissues (malformation tumors)
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Epidermoid, dermoid, teratoma, teratoid, intra-arachnoid cyst
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Variable (fourth ventricle and cerebellopontine angle for epidermoid, quadrigeminal cistern for intra-arachnoid cyst)
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Base of brain above sella turcica
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Variable (eg, hypothalamus)
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Mammary gland adenocarcinoma, pulmonary carcinoma, prostatic carcinoma, chemodectoma, malignant melanoma, lymphosarcoma, salivary gland adenocarcinoma, hemangiosarcoma, etc
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Primary tumors from surrounding tissues
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Osteosarcoma, lipoma, osteochondroma, chondrosarcoma, fibrosarcoma, nasal adenocarcinoma, hemangiosarcoma, multiple myeloma, calcifying aponeurotic fibromatosis, epidermoid cyst, etc
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