What does a Category 1 mammogram mean?
Mia Morrison
Updated on March 18, 2026
What does a Category 1 mammogram mean?
A BI-RADS category 1 means the mammogram, breast ultrasound and/or MRI breast show no suspicious findings for cancer. “Negative” in this connotation is good – it means there are no signs to suggest breast cancer. The majority of breast imaging studies will fall in this category.
What is Category B in mammogram?
Radiologists use mammogram images to grade breast tissue based on the proportion of dense to nondense tissue. According to the BI-RADS reporting system, the levels are (from left to right) A: almost entirely fatty, B: scattered areas of fibroglandular density, C: heterogeneously dense, and D: extremely dense.
What are the 4 categories of breast density?
There are four levels of breast density:
- Level 1: Almost all fatty tissue (1 out of 10 women)
- Level 2: Scattered areas of dense tissue, but mostly fatty tissue (4 out of 10 women)
- Level 3: Mixed dense and fatty tissue, also called heterogeneous (4 out of 10 women)
- Level 4: Extremely dense tissue (1 out of 10 women)
Should Birads 3 be biopsied?
BI-RADS 3 is strongly discouraged as a final assessment from a screening mammogram. Finally, BI-RADS 3 is not to be used as a category of uncertainty and should not be used as a safety net to place findings that a radiologist is unsure whether to pass as benign or biopsy.
What does Birads Category 4 mean?
A category 4 score indicates a suspicious finding or abnormality. In this instance, there is a 20 to 35 percent chance of cancer. To confirm, your doctor will need to perform a biopsy to test a small tissue sample.
Can I get a mammogram at 37?
In general, screening mammograms are not recommended for women under 40 years old. However, for women with genetic mutations, screening can begin at 25, and in women with a family history of breast cancer, screening is often initiated 10 years earlier than the first affected relative in the family.
At what age are mammograms no longer necessary?
For women with no history of cancer, U.S. screening guidelines recommend that all women start receiving mammograms when they turn 40 or 50 and to continue getting one every 1 or 2 years. This routine continues until they turn about 75 years of age or if, for whatever reason, they have limited life expectancy.
