Simple descriptors and simple rules of the International Ovarian Tumor Analysis (IOTA) Group: a prospective study of combined use for the description of adnexal masses.

Objective: External validation of the IOTA group's three-step diagnostic model (Strategy 1) and comparison with assessment by an expert sonographer (Strategy 2).

Study Design: Prospective study in patients with persistent adnexal masses, in which an inexperienced sonographer performed transvaginal ultrasound applying simple descriptors (SD) and rules (SR) for classifying as benign or malignant. Any non-classifiable mass was then submitted to an expert examiner for subjective assessment (SA).