Heterogeneous density is mixed
density, say fluid, solid components, may be
gas etc. Now as the finding is in the pelvis, it could arise from the bladder, the uterus, the ovaries the rectum and sometimes the bony structures there. So, its difficult to tell exactly from where it is. So, like for e.g if you have bladder symptoms and an abnormal urine study, then mostly likely the ‘density’ could be originating from the bladder.