A member asked:

Why do breast mris need to be done between the 6th and 16th day of your cycle? also, is the 1st day of bleeding the 1st day of cycle? thanks

3 doctors weighed in across 2 answers
Dr. Stephen Richards answered

Specializes in Obstetrics & Gynecology

Less density: Day 1 if the first day of bleeding. Before ovulation (around d14 on 28day cycle) breasts are less dense do to mainly estrogenic effects and not progesterone.

Answered 10/4/2016

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Dr. Paul Velt answered

Specializes in Diagnostic Radiology

Because of water: During various times of your cycle, you retain more or less water. Bloating I am told by my wife. That retained fluid is also retained in the breasts. That fluid influence how the breasts look on MRI and May even hide things like small cancers. Usually the first day of bleeding is day 1. Usually

Answered 8/13/2014

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