intraaxial masses - infratentorial Flashcards
Where is the most common location for JPA?
Posterior fossa
Vermis/hemispheres, 3rd ventricle, optic chiasm
What is the imaging of JPA?
Well demarcated cystic with enhancing mural nodule, little surrounding edema
often dont enhance, occasional calcification
What is associated with optic pathway JPA?
NF1
What is the DDx for posterior fossa tumor? What is most common?
Medulloblastoma, Ependymoma, JPA, brainstem glioma
Medulloblastoma
What is associated with optic pathway JPA?
NF1
What is the appearance of brain stem astrocytoma? Who gets them?
Children,
What is the DDx for posterior fossa tumor? What is most common?
Medulloblastoma, Ependymoma, JPA, brainstem glioma
Medulloblastoma
What is the appearance of ependymoma in the posterior fossa?
What is a key differentiating feature from medulloblastoma?
CT: calcification, cysts/edema 50%, hemorrhage
MR: FLAIR bright, T1 iso, enhance
TOOTHPASTE appearance: squeeze through foramen of munro and luschka into basal cisterns
Where are the common locations for hemangioblastoma?
What are the associated conditions?
What is the classic appearance?
What is the association with spinal hemangioblastoma?
Cerebellar hemispheres, vermis, medulla, spinal cord
VHL (worse prognosis), polycythemia
Cystic mass with enhancing mural nodule
Flow voids are prominent within nodule, nodule abuts pia or ependyma
Associated with syrinx
What is lhermitte duclos? What is the associated condition?
When do they occur?
What is the imaging?
CEREBELLAR Hamartoma and part neoplasm “Dysplastic cerebellar gangliocytoma”
Cowden syndrome - multiple hamartomas and increased risk of several cancers
30’s
Striated or cordurouy pattern, bright T2/FLAIR that rarely enhances
What other tumor needs to be distinguished and how?
ATRT, these are usually
What is the appearance of ATRT? What is the key differentiating feature? What is the associated abdomen finding?
Similar to medulloblastoma (restricted diffusion, hyperdense, enhancement)
What is the appearance of ependymoma in the posterior fossa?
What is a key differentiating feature from medulloblastoma?
CT: calcification, cysts/edema 50%, hemorrhage
MR: FLAIR bright, enhance
TOOTHPASTE appearance: squeeze through foramen of munro and luschka into basal cisterns
What is lhermitte duclos? What is the associated condition?
When do they occur?
What is the imaging?
CEREBELLAR Hamartoma and part neoplasm “Dysplastic cerebellar gangliocytoma”
Cowden syndrome - multiple hamartomas and increased risk of several cancers
30’s
Striated or cordurouy pattern, bright T2/FLAIR that rarely enhances
Which tumor is more commonly infratentorial in adults and supratentorial in kids?
Choroid plexus papilloma
