Term
| What are primary embryonal nervous system tumors of the brain called? |
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Definition
| -group of embryonal tumros called primitive neuroectodermal tumors (PNETs_ |
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Term
| What is Medulloblastoma? What does it look like? |
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Definition
-PNET seen in young cattle
-soft white-tan mucoid expanding mass in the cerebellum &/or 4th ventricle (often mistaken for an abscess at necropsy) |
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Term
| Are primary brain tumors usually benign or malignant? |
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Definition
-mostly bening
-grow by expansion & rarely met |
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Term
| What is the most common primary neuro tumors in dogs & cats? |
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Definition
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Term
| What is the second most common primary neuro tumor in dogs & cats? |
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Definition
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Term
| Which tumors affect the glia? |
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Definition
-atrocytoma
-oigodendroglioma
-glioblastoma |
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Term
| What tumors affect the choroid plexus? |
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Definition
| -choroid plexus papilloma or carcinoma |
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Term
| What tumors affect the ependyma? |
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Definition
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Term
| Describe the behavior of a meningioma,. |
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Definition
| -grows on surface of brain or spinal cord and compresses the underlying tissue |
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Term
| From what do meningiomas arise? |
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Definition
| -ventral, dorsal, lateral, cranial, caudal meninges |
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Term
| What are oligodendrogliomas, astrocytomas (gliomas)? |
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Definition
| -glial tumors arise within the brain parenchyma and usually grow by expansion |
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Term
| What are ependymomas & choroid plexus papillomas? |
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Definition
| -benign and arise w/in ventricles |
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Term
| What is choroid plexus carcinomatosis? |
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Definition
| -choroid plexus tumors are malignant and cells implant along th eventricles, subarachnoid space, or central canal of spinal cord |
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Term
| Which tumors most commonly metastasize to the brain? |
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Definition
| -lung and mammary carcinomas |
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Term
| What is a nephroblastoma? Who gets them? |
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Definition
-tumor within dura compresses the spinal cord maily in the lumbar area, thought to arise from misplaced renal primordium that develops into a tumor in the subdural space
-dogs 6-36 months old |
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Term
| What are nerve sheath tumors? Most common site? |
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Definition
-can occur in any site that there are nerves
-skin & subcutis most common
-also large peripheral nn, cranial nn, spinal nn, heart of aged cattle |
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Term
| What are some synonyms for nerve sheath tumors? |
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Definition
-schwannoma
-neurofibroma
-neurolemmoma |
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