Early-stage cervical cancer: tumor delineation by magnetic resonance imaging and ultrasound - a European multicenter trial.

Objective: To compare the diagnostic accuracy of ultrasound (US) and magnetic resonance imaging (MRI) in the preoperative assessment of early-stage cervical cancer using pathologic findings as the reference standard.

Patients And Methods: Prospective multi-center trial enrolling 209 consecutive women with early-stage cervical cancer (FIGO IA2-IIA) scheduled for surgery. The following parameters were assessed on US and MRI and compared to pathology: remaining tumor, size, tumor stromal invasion<2/3 (superficial) or ≥2/3 (deep), and parametrial invasion.