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Lipoma is the most common soft tissue tumor arising from yellow fat. It presents as a mobile, lobular mass that is non-tender and has a semi-fluctuant consistency. On examination, the mass can slip under the examining fingers, known as the "slip sign". Lipomas most commonly occur just under the skin, but can also develop in various deep locations like intermuscularly, intra-articularly, or retroperitoneally. While lipomas are usually benign and can be excised with clear margins, liposarcomas are rare malignant versions that require wide excision and potentially adjuvant therapies.Read less