A 27-year-old male asked:
i have a possible deep lipoma on lower back near spine. it is palpable, but it did not show up on an ultrasound. is it safe to say it isn't cancerous?
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No: An ultrasound can not differentiate the fat that makes up a lipoma from the surrounding fatty tissues under the skin and will not definitively be able to differentiate a cancer from a non-cancer. If the lump is hurting then have it removed and it should be sent for pathological analysis. That will tell you if it is a cancer (Malignancy) or not. A true lipoma is not typically dangerous.
Answered on Mar 15, 2015
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