Pseudoangiomatous Stromal Hyperplasia

High magnification micrograph of pseudoangiomatous stromal hyperplasia
Image by Nephron (CC BY-SA 3.0)

Pseudoangiomatous stromal hyperplasia is the presence of excess breast support (stromal) tissue in an area that forms a lump or may involve large parts of the breast to make it firm and lumpy. These benign growths can increase in size quite quickly and may be mistaken for a fibroadenoma of breast cancer. They can be surgically removed if only a small area is involved.

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