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— Gutenberg Classification: Ultrasonographic patterns of RPOC (Tinelli and Haimovich, 2017).
| Type 0: Hyperechogenic avascular mass |
| Type 1: Different echoes with minimal or no vascularity |
| Type 2: Highly vascularized mass confined to the cavity |
| Type 3: Highly vascularized mass with highly vascularized myometrium |
