“…Phlegmasia cerulea dolens causing acute compartment syndrome in the upper extremity has been rarely described, and if present, the recommendations are to perform urgent thrombolysis or thrombectomy. 2,3,11 The unique surgical situation that arose in this patient, however, was that given her tenuous cardiopulmonary status in the setting of COVID-19 sepsis, she was unable to be brought to the operating room or interventional radiology suite. The complete reversal of the blood flow up to the subclavian artery during diastole, detected using ultrasonography, displays the striking potential of compartment pressures in this pathology.…”