Lee et al reported the Asan Intracranial Meningioma Scoring System (AIMSS) for predicting rapid growth of an intracranial meningioma. This can help to identify a patient who may require more aggressive management. The authors are from Asa Medical Center and University of Ulsan.
Patient selection: intracranial meningioma
Outcome: rapid growth (annual growth > 2 cc per year
Parameters:
(1) tumor diameter in cm
(2) calcifications
(3) peritumoral edema
(4) T2-weighted MRI
Parameters
Finding
Points
tumor diameter
<= 2.5 cm
0
2.6 to 4.0 cm
3
> 4 cm
6
calcifications
absent
2
present
0
peritumoral edema
absent
0
present
1
T2-weighted MRI
hypointense
0
isointense
2
hyperintense
2
total score =
= SUM(points for all of the parameters)
Interpretation:
• minimum score: 0
• maximum score: 11
value of X =
= (0.67 * (score)) + (intercept)
probability of rapid tumor growth =
= 1 / (1 + EXP((-1) * X))
Score
Risk Group
0 to 2
low (< 10%)
3 to 6
intermediate (10-50%)
7 to 11
high (> 50%)
Performance:
• The area under the ROC curve is 0.87.
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