Objective:

To determine and compare the diagnostic performance of the Simple Ultrasound-Based Rules (SUR), Sonographic Morphology Index (SMI) and the Jacob´s Risk Malignancy Index (RMI) in the diagnosis of benignity or malignancy to an adnexal tumor.

Materials and methods:

Retrospective, cross-sectional and analytical study at the at the Hospital Militar de Especialidades de la Mujer y Neonatología of Mexico City. Patients with ultrasound diagnosis of adnexal tumor who underwent surgery were included. The diagnostic performance of the indices compared to histopathological diagnosis was studied using contingency tables.

Results:

141 women and 166 tumors were included for analysis, 22 cases were bilateral. Of the sample analyzed, 79 were premenopausal and 62 postmenopausal. Cases of malignant neoplasm were 43 (25.9%) and benign 123 (74.1%). The SMI had a sensitivity of 98.8%, specificity of 33.3%, positive predictive value (PPV) of 33.9%, and negative predictive value (NPV) of 97.6%. SUR showed a sensitivity of 97.2%, specificity of 71.1%, PPV of 55.6% and NPV of 98.6%; And RMI had a sensitivity of 72.7%, specificity of 79.3%, PPV of 55.8% and NPV of 89.4%.

Conclusions:

The simple ultrasonographic rules are a presurgical model that in 82% of the cases allowed to classify the adnexal tumors in benign or malignant. Indeterminate cases should be reevaluated by an expert sonographer. The method is reproducible by evaluators of medium experience and susceptible of being applied in hospital institutions of the second and third level of care.

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