Is it possible to differentiate lipoma and liposarcoma on ultrasonographic image? Is surgery needed?

Patient : Dear Doctor, I am 30 years old, 182 cm height, 89 kgs, male. I have discovered lump on my lower back four months ago, not on the surface, but 3-4 mm deeper. So I had Doppler ultrasound diagnostic screening recently with USG Toshiba Xario XG model SSA-680. The doctor discovered "an elipsoidal intramuscular lipoma", length: 2 cm. She told me not think of anything worse, like liposarcoma. As to removal of the tumour she said I might but do not have to. But on which grounds she was sure it is lipoma? Can ultrasonography really differentiate between lipoma which is benign and liposarcoma which is malignant? I have heard USG cannot spot the difference. Should I have the tumour cut now or should I do something else for now?
Symptoms:  Tumour and discomfort on lower back
Is it possible to different...-1
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