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There is an encapsulated collection at site of swelling. It is in subcutaneous plane, abutting fascia. Mobile internal low level echoes are present. Thin wall ( 1 - 1.5 mm ) is noted. No internal septa / vascularity.
Perilesional fat shows increased echogenesity.
Subcutaneous non-thrombosed vein is noted abutting deeper surface of the lesion.
Underlying muscles are normal.