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Hi, thanks, ***** ***** your query, will be replying in few seconds please. DrVasavada
Ultrasound is good for soft tissue scan so diagnosis of fat tissue giving rise to swelling may be correct. X ray showing fragmented bone might mean the mass is arising from bone and has caused cracking up of leg bone. Knee joint will be locked by some loose fragment inside knee joint and so if still giving problem the mass might have again caused loose fragment.
If mass is not bothering and remains static, really no fracture risk. May need no operation or biopsy.
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