hi, my wife has this lower abdominal pain only when shes sitting down straight up for long hours and right below her left breast theres some kind of lump which is a size of a golf ball and its hard when you touch it, she has done mri and citi to find out what that lump could be but it didnt show up in any of those tests, we are just curious to know what could it be, its definately not cancerous which was confirmed by the doctor, im getting really worried about her please help