A 21-year-old woman presented to the emergency department with an 8-month history of swelling and pain in the right thigh. MRI of the right leg revealed a large periosteal femoral mass and thrombus in the right femoral vein, for which she received anticoagulation therapy. The patient subsequently experienced dyspnea and pleuritic chest pain, and a chest x-ray was done.
What is the likely diagnosis? *This case is from Docplexus Editorial Team for educative purpose only Source: NEJM Click here for correct answer!