Ovarian Tumor Index1

Patient age (years)
Ovarian volume
height (cm) width (cm) length (cm)
Sassone Morphology scale2
Inner Wall Structure Wall Thickness Septa Echogenicity
1 smooth thin, <3 mm none sonolucent
2 irregularities <3 mm thick, >3 mm thin, <3 mm low echogenicity
3 papillarities >3 mm not applicable, mostly solid thick, >3 mm low echogenicity with echogenic core
4 not applicable, mostly solid - - mixed echogenicity
5 - - - high echogenicity
Pulsatility Index
pulsatility index
OR
systolic peak velocity end-diastolic velocity time-average max velocity
OR
avascular (pulsatility index of 3.3 will be used which is 1 SD)
Vessel Location
peripheral central septal avascular (must be used if PI is avascular)
Intense echoes

Retrospectively derived data from author's patient population.

1Twickler DM, et.al. (1999), "The Ovarian Tumor Index Predicts Risk for Malignancy", Cancer, 86:2280-90.

2Sassone AM, et.al. (1991), "Transvaginal Sonographic Characterization of Ovarian Disease: Evaluation of a New Scoring System to Predict Ovarian Malignancy", Obstet Gynecol 78:70-6.