What is Hypoechoic to Isoechoic Nodule

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An isoechoic mass in the uterus is a mass that has the same density as the uterine tissue. This is most often a fibroid. Talk with your health care provider for advice specific to your situation.

An isoechoic mass in the uterus appears similar in echogenicity to surrounding tissue on an ultrasound scan, making it challenging to distinguish from normal tissue. This type of mass may require further evaluation, such as additional imaging or a biopsy, to determine its nature and potential impact on health.

That would be a "hard pea-sized lump that doesn't show up on ultrasound".