1. Intramedullary: Astrocytoma
Astrocytomas
Astrocytomas are the second most common spinal intramedullary glioma.
They are the most common primary spinal cord neoplasms in children.
Epidemiology
Lack of sex predilection.
24–30% of adults Up to 90% of children 3rd and 4th decades for adults.

2. Location Thoracic (most say cervicothoracic 50% in upper thoracic)
Location Thoracic (most say cervicothoracic 50% in upper thoracic). Eccentric in the spinal cord. Enhancement Heterogeneous, mild to moderate, partial. Borders Ill defined. It may contain Cysts, necrosis, or hemorrhage. Signal characteristics include: T1WI: Hypointense to Isointense T2WI: Hyperintense (mild).

4. Intramedullary: Ependymoma
Ependymoma is the most common primary cord neoplasm
They are slow-growing, benign, well-circumscribed lesions that may be focal or involve long segments of the cord.
They commonly occur within the conus and filum terminale but may be found anywhere in the spinal cord.

5. Location Epidemiology Signal characteristics include:
Cervical, conus, filum terminale (MP)
Centrally located in the cord.
Epidemiology
There is no sex predilection, 60% of adult, 30-60yrs of life.
Signal characteristics include:
T1WI: Hypointense (Except MP which can be hyperintense).
T2WI: Hyperintense (mild).

6. Ependymoma

7. Enhancement
Homogenous, may be only mild and moderate.
Borders
Well defined.
May be associated with:
Edema, cystic degeneration, haemorrhage, calcium, spinal cord cyst and hemosiderin cap.

8. 6 Histological subtypes of ependymoma
Cellular (the most common intramedullary type)
Papillary
Clear cell
Tanycytic
Myxopapillary
Virtually always located along the filum terminale with occasional extension into the conus medullaris
6. Melanotic (the least common type)

9. Intramedullary: Syringohydromyelia
Seen with:
Congenital lesions
Chiari I & II
Tethered cord
Acquired lesions
Trauma
Tumors
arachnoiditis
Idiopathic