Chaker et al reported a score for predicting urinary fistula in a patient with renal hydatid cysts. The authors are from the University of Tunis El Manar.
Patient selection: renal hydatid cysts
Parameters:
(1) cyst diameter in cm
(2) cyst location in kidney
(3) hydaturia
(4) absolute eosinophil count per microliter
Parameter
Finding
Points
cyst diameter
< 5 cm
0
>= 5 cm
3
cyst location
mid-renal
0
upper or lower pole
2
hydaturia
no
0
yes
6
eosinophil count
< 500 per µL
0
>= 500 per µL
4
total score =
= SUM(points for all of the parameters)
Interpretation:
• minimum score: 0
• maximum score: 15
• A score >= 8 had a specificity of 100% but sensitivity of 46% for urinary fistula.
• The maximum Youden score was for >= 3 with sensitivity of 80% and specificity of 79%.
Performance:
• The area under the ROC curve is 0.80.
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