1-2-3 rule (ovary)
The 1-2-3 rule is a simple aide memoire describing the nomenclature of any small simple anechoic structure in the ovary on ultrasound:
- <1cm: follicle
- 1-2cm: dominant follicle
- >3cm: cyst
The 1-2-3 rule is a simple aide memoire describing the nomenclature of any small simple anechoic structure in the ovary on ultrasound: