Thompson et al reported a risk score for a patient with a solitary fibrous tumor of the orbit. This can help to identify a tumor that is more likely to recur. The authors are from the University of California Los Angeles and the Southern California Permanente Medical Group.
Patient selection: solitary fibrosus tumor (SFT) of the orbit
Outcome: recurrence
Parameters:
(1) age in years at presentation
(2) tumor size in cm
(3) number of mitoses per 2 square mm
(4) cellularity
(5) cellular and nuclear pleomorphism
(6) tumor necrosis
Parameter
Finding
Points
age at presentation
<= 45 years
0
> 45 years
1
tumor size
<= 3 cm
0
> 3 cm
2
mitoses
<= 4 in 2 square mm
0
> 4 in 2 square mm
3
cellularity
low
0
moderate to high
1
pleomorphism
low
0
moderate to high
1
tumor necrosis
absent
0
present
1
total score =
= SUM(points for all of the parameters)
Interpretation:
• minimum score: 0
• maximum score: 9
Total Score
Risk of Recurrence
0
very low
1 or 2
low
3 or 4
intermediate
5 to 9
high
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