Just got a mammogram finding of a 1.7 cm focal asymmetry in the 6:00 to 6:30 axis of the left breast. what does this mean?

Complete the workup: You do not know yet. What is true: mammogram was not completely normal (had a focal asymmetry). Therefore, you need additional testing to try to determine the cause and significance of the finding. First step would be spot mammograms and an ultrasound of the area. Mri may also be helpful, but a biopsy may eventually be necessary to look at the cells under a microscope and make the diagnosis.

A focal asymmetry: is not a mass, it is an area of tissue that stands out from the normal symmetrical distribution of breast tissue. 6:00-6:30 is the position in the breast, as if the breast were a clock face looking from the front. Since the asymmetry is a potential abnormality, you will probably need extra mammo views and maybe ultrasound to sort it out. 80% of the time this turns out to be nothing of concern.