What happens after a lumpectomy without a drainage tube when the breast is filled with liquid?

Lumpectomy Seroma: Seroma is a collection of watery fluid in a space created by surgery or trauma. Seroma formation is a natural process that normally occurs after lumpectomy or mastectomy. Most seromas are small (under 2 ounces), cause minimal symptoms, and are absorbed by the body over weeks or months. Larger seromas may cause swelling and pain, and are best managed with aspiration using a needle or drain