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1-2-3 rule (ovary)

Last revised by Dr Jeremy Jones on 25 Aug 2021

The 1-2-3 rule is a simple aide-mémoire describing the nomenclature of any small simple anechoic structure in the ovary on ultrasound:

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Cases and figures

  • Case 1: Polycystic ovaries with multiple follicles
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  • Case 2: Ovarian cyst
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