History of right lower extremity swelling and pain. Limited evaluation of the right knee infrapatellar region demonstrates significant subcutaneous soft tissue edema. Deep to the patellar tendon and there is a poorly defined hypoechoic avascular focus, suspicious for a small fluid collection. There is surrounding soft tissue hyperemia.
Evidence of cellulitis and small fluid collection deep to the distal patellar tendon with surrounding hyperemia, appearance suspicious for a small abscess. Clinical correlation and additional imaging should be considered.