Probably benign mass ( probably benign category 3 ).

1- Definition: A finding placed in this category should have a very high probability of being benign. It is not expected to change over the follow-up interval, but the radiologist would prefer to establish its stability. Data are becoming available that shed light on the efficacy of short interval follow-up. 

2-A mass to be involved in this category should be circumscribed on mammogram and benign appearing on sonogram.

3-In the presence of old films, we cannot use this category 

( probably benign category 3 ).