rim

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Her ultrasonography of the abdomen and pelvis revealed a hyperechoic with partially hypoechoic rim arising from the uterus measuring 4.
The ultrasound feature is usually a well-defined mass containing wavy internal echogenic focus with a hypoechoic rim and a strong posterior shadow.
Both thick peripheral hypoechoic rim patterns and the absence of a rim surrounding a thyroid nodule, which represents pericapsular inflammatory infiltration, have been reported to be indicators of malignancy (24).