Colloid cysts: Difference between revisions
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(Created page with "= Colloid Cyst Risk Score = +1 for + criteria # Age <65 # H/A # Axial diameter ≥7mm # Risk zones (zone 1 & 3) * ≥4 points = high risk for cyst progression and symptoms * 3 points = intermediate risk for cyst progression or symptoms * ≤2 points = low risk for cyst progression or symptoms == Anatomic risk zones for colloid cysts of the third ventricle == thumb The third ventricle was divided...") |
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# Risk zones (zone 1 & 3) | # Risk zones (zone 1 & 3) | ||
Latest revision as of 11:30, 22 May 2024
Colloid Cyst Risk Score
+1 for + criteria
- Age <65
- H/A
- Axial diameter ≥7mm
- FLAIR Hyperintensity
- Risk zones (zone 1 & 3)
- ≥4 points = high risk for cyst progression and symptoms
- 3 points = intermediate risk for cyst progression or symptoms
- ≤2 points = low risk for cyst progression or symptoms
Anatomic risk zones for colloid cysts of the third ventricle
The third ventricle was divided into three zones along the sagittal axis.
- Zone I—from lamina terminalis to a vertical line drawn from the mammillary body and tangential to the massa intermedia;
- zone II— from the posterior boundary of zone I to the rostral apex of the midbrain tegmentum at the inlet of the cerebral aqueduct;
- zone III—from the posterior boundary of zone II to the posterior limit of the third ventricle.
Zones I and III are referred to collectively as “risk zones.”
Lesions in zone II can be large and are rarely symptomatic.