I was hit in the breast 12months ago by exercise equipment (really hard blow), had a bruise, not much pain, and it healed. Now I have a hard, firm, non-tender, non-moving pea size lump. Can trauma that long ago be producing a lump now? I do not recall any lumps at time of whammy to breast nor up to 2 weeks ago. Scheduled for mammo & ultrasound...if it's necrosis will it be obvious to the radiologist?