Management of Persistent Leg Pain and Swelling Following Cortisone Injection

Immediate Diagnostic Workup

Obtain a comprehensive duplex ultrasound (CDUS) now, scanning from the inguinal ligament to ankle, including posterior tibial and peroneal veins in the calf, with compression and Doppler evaluation, as recommended by the American College of Chest Physicians for patients with persistent symptoms despite negative initial DVT workup 2, 3
The initial negative ultrasound does not exclude DVT when symptoms persist or worsen, and repeat imaging is mandated by guidelines from the American College of Chest Physicians for such clinical scenarios 1, 2
Persistent unexplained bilateral leg swelling after negative initial ultrasound is a specific indication for repeat imaging within 5-7 days of clinical decision, according to the American College of Chest Physicians, though immediate imaging is required given the 2-month duration of symptoms 1, 2

If the repeat complete duplex ultrasound is negative but symptoms persist, image the iliac and pelvic veins with CT or MR venography, as suggested by the American College of Chest Physicians for extensive unexplained leg swelling 4, 5, 6
Extensive unexplained leg swelling with normal compression ultrasound suggests iliocaval DVT that may not be adequately visualized on standard ultrasound, and the American College of Chest Physicians recommends iliac vein imaging in such cases 4, 5, 2

Ultrasound can identify Baker's cyst, lymphedema, or other "cystic" lesions causing leg swelling that mimic DVT, according to the American College of Chest Physicians 2

Initiate anticoagulation immediately with low-molecular-weight heparin or direct oral anticoagulant if proximal DVT is confirmed, as recommended by the American College of Chest Physicians 2
For provoked DVT, 3 months of anticoagulation is typically sufficient, according to the American College of Chest Physicians 2

Assess severity of symptoms and risk factors for extension, and for severe symptoms, initiate anticoagulation rather than surveillance, as suggested by the American College of Chest Physicians 2

Refer to vascular surgery if iliocaval DVT is confirmed and symptoms are severe or refractory to anticoagulation, according to the American College of Chest Physicians 4, 5

Refer for thrombophilia workup if unprovoked DVT is confirmed, particularly given the temporal relationship to a minor procedure, as recommended by the American College of Chest Physicians 2
Consider hematology consultation if DVT is confirmed to guide duration of anticoagulation and assess for underlying hypercoagulable state, according to the American College of Chest Physicians 2

Do not assume the initial negative ultrasound definitively excludes DVT, and persistent symptoms mandate repeat imaging regardless of initial results, as emphasized by the American College of Chest Physicians 1, 2
Do not accept limited proximal-only ultrasound, and ensure complete leg evaluation from groin to ankle given the symptom severity and duration, as recommended by the American College of Chest Physicians 2, 3
Do not miss iliocaval DVT by failing to image above the inguinal ligament when standard leg ultrasound is negative but symptoms persist, according to the American College of Chest Physicians 4, 5, 6
Do not overlook superficial thrombophlebitis, which can present with pain and swelling and may require treatment, as noted by the American College of Chest Physicians 2
Do not delay imaging, as 2 months of persistent symptoms following a procedure is not normal and requires definitive diagnosis now, as emphasized by the American College of Chest Physicians 1, 2