Lobular carcinoma left breast
Routine screening mammogram
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Subtle parenchymal density deep in the breast just medial of the breast equator.
This density was on two previous mammograms. It had increased slightly in volume. Workup showed an ultrasound visible mass: diagnosis lobular carcinoma.
Do not leave these densities without workup. Compare with the oldest previous you have and make sure your PACS is programmed to do just that. These lobular cancers can show little change year on year.
We know we miss lobular cancers in large series of screening studies. They do not behave like the typical IDC, very little scirrhous reaction and the asymmetry in density can be really subtle. High index of suspicion is key. Read your screening studies in an isolated environment without you iPhone.