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There is a linear echogenic structure at site of swelling pointed by patient - Foreign body.
Length - about 14 mm
Thickness - about 3 mm
Superficial end - lies in subcutaneous fat.
Deeper end - lies in deltoid muscle.
There is thin hypoechoic rim around foreign body - granulation.
There is no local collection.
Dopplar - Twinkle artifact is noted due to irregular surface of foreign body.