Any Thyroid Cancer patients who later developed Breast Cancer and Ultrasounds

Hi! I was just wondering if any of you out there are previous Thyroid Cancer patients who later also developed Breast Cancer, and if so, what were the signs and symptoms you experienced that led you to further investigate odd breast changes or lumps? Anyone ever have a breast ultrasound done on a lump in the breast that can be felt but the lump not show up on computer monitor screen, or have what is referred to as irregular areas in the breast near lump show on the screen when the tranducer wand is moved across the breast in one direction during the breast ultrasound, but when moved across the breast and breast lump in another direction, no irregular areas show up on the screen? Does this mean that lump is only Fibrocystic tissue or could it still be a possible tumor, etc...? I would appreciate any help, suggestions and any input at all. Thanks.