A 44-year-old Indian woman comes to the emergency room with complaints of soreness of the right leg and fatigue. The pain started after a long flight from South Africa two days ago. Her medical history is significant for diabetes. She has been recovering from surgical removal of her uterus (hysterectomy) performed 10 days ago. She had to fly due to a family emergency, interrupting her post-surgery home rest. She smokes one pack of cigarettes daily. On examination, she is obese, afebrile and anxious. She has obvious swelling in the right lower leg with calf swelling of 4 cm compared to the other leg. There are collateral superficial veins present; her entire leg is swollen with pitting edema. There is some tenderness of the calf that increases when the calf is gently squeezed. Her pain also increases with dorsiflexion of her right foot with knee extended. There is no redness of the leg. She was admitted to the hospital and later an ultrasound of her leg confirms the diagnosis. What is the most likely diagnosis in this patient?
