Glossary of Neuro 1--Brain tumor DDx
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- How is the pediatric population divided with regard to brain tumor?
- Neonates and infants (under 2 years)
- How common are brain tumors in the under 2 yrs group?
- How common are they in the older (>2) group?
- Second only to hematopoietic tumors with regard to neoplasms
- What proportion of brain tumors are supratentorial in neonatal/infant group?
- What is the most common brain tumor in the neonatal period?
- What are the common tumors in in the under 2 group?
Choroid plexus papilloma
- What are the common types of astrocytoma in the under 2 group?
- Very aggressive types: Anaplastic or GBM
- What proportion of brain tumors are supratentorial in the older group?
- What are the common neoplasms in this group?
Pineal region tumors
- What percent of tumors are gliomas in this group.
- What percent are PNETs?
Medulloblastoma is just a subset of these
- What percent are ependymoma?
- What percent are craniopharyngioma?
- What percent are pineal region?
- What is true of gliomas in this group?
- Most are astrocytomas
- What percent of supratentorial neoplasms in this group are astrocytomas?
- What is true of astrocytomas in this group?
- Most are low grade:
Pilocytic or other low grade
- What are other gliomas in this age group?
- What tumors occur in the infratentorial region?
- Cerebellar astrocytoma
- What percent of infratentorial neoplasms are cerebellar astrocytoma?
- What percent are PNET?
- What are these PNETs?
- What percent are brainstem glioma?
- What is true of most cerebellar astrocytomas?
- What is true of pontine brainstem gliomas?
- All are malignant
- What is true of medullary gliomas?
- More benign
- What is special about medulloblastomas?
- Most arise in the vermis
- What percent arise in vermis?
- Where do the rest occur?
- Most of rest in cerebellar hemispheres
- What is the most common adult primary brain tumor?
- What percent are gliomas?
- What are most gliomas?
- What percent of gliomas are astrocytomas?
- What are the most common astrocytoma types in adults?
- More than 50% of all astrocytomas are Anaplastic or GBM.
- What is the second most common primary brain tumor?
- What percent of all brain tumors in adults are meningiomas?
- What percent of all brain tumors are sellar/parasellar?
- What is the most common of these?
- Pituitary adenoma
- What is the next most common glioma after astrocytoma?
- What percent of all primary brain tumors is this?
- What is the most rising incidence primary brain tumor?
- What do the most common infratentorial neoplasms in adults have in common?
- All are extraaxial
- What are these?
- What is the most common intraaxial infratentorial brain tumor?
- What are the most common primary intraaxial posterior fossa tumors?
- What is the most important factor in arriving at a differential diagnosis of a brain mass?
- What is the second most common factor?
- Patient age
- What are the main criteria for location?
- Intraaxial or extraaxial
Supratentorial or infratentorial
- Besides basic parenchymal lesions, what are the specific lesion locations which can provide for a differential diagnosis?
- Cerebellopontine angle
- Foramen magnum
- Skull base and cavernous sinus
- Scalp, calvarium, meninges
- What is the location of the pineal gland?
- Posterior to the third ventricle
- What is inferior to the pineal gland?
- Posterior commisure of corpus callosum
- What else is inferior to the pineal?
- Tectal plate
- What are the structures of the pineal region?
- Pineal gland
Posterior aspect of third ventricle and cerebral aqueduct
- What cisterns are in the pineal region?
- Quadrigeminal plate
- What other structure, which may be recognizable on imaging, is also a cistern like structure in the pineal region?
- Velum interpositum
- What portions of brain are in the pineal region?
- Specifically, what part of corpus callosum is in pineal region?
- What anatomic dural structure is in the pineal region?
- Tentorial apex
- What veins are in the pineal region?
- Internal cerebral veins
Vein of Galen
- What arteries are in the pineal region?
- Posterior cerebral artery
Posterior choroidal artery
- What portion of the third ventricle is in closest approximation to the pineal gland?
- Suprapineal recess of third ventricle
- Where does the suprapineal recess go?
- Extends posteriorly, immediately above the pineal gland
- Where is the quadrigeminal plate cistern in relation to the pineal gland?
- Posterior to it
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