 |
| T2-AXIAL IMAGE |
 |
| T1-AXIAL IMAGE |
 |
| FLAIR-AXIAL IMAGE |
 |
| CONTRAST ENHANCED T1 AXIAL IMAGE |
A 7 year old child presented with ataxia and dizziness. MRI of brain shows increased volume and abnormal signal in right cerebellar hemisphere with a characteristic "striated" appearance on T2. There is mass effect on the 4th ventricle. It shows mild patchy enhancement.
SALIENT RADIOLOGICAL FEATURES:
- It is also called dysplastic cerebellar gangliocytoma
- Well defined cerebellar lesion involving usually unilateral hemisphere.
- It may be large and involve the entire hemisphere as in this patient.
- Widened cerebellar folia with a characeteristic "layered" or "striated"appearance on T2
- It is hypointense on T1 and may show striated appearance with alternating layers of isointense and hypointense signal
- Calcification may be seen rarely
- These may show bright signal on DWI due to T2" shine through"
- There is no diffusion disturbance on ADC map.
- Rarely, some lesions may enhance
- MRS may show elevated lactate. There is diminished NAA, choline and myoinositol
REFERENCES:
Jones BV: Dysplastic Cerebellar Gangliocytoma.
Diagnostic Imaging Brain: First Edition. Amirsys: I-6-70, 2005.
