A 43-year- old woman presents to the surgical outpatients with right leg swelling. This first appeared 3 weeks ago and has gradually increased such that she now finds it difficult to put on her shoe.The general examination is otherwise unremarkable. She is otherwise symptomless. There is no history of trauma to the limb. Apart from a tonsillectomy as a child, there is no past history of note. She is on an oral contraceptive pill. Examination There is unilateral swelling of the right lower leg from the foot to just above the knee (image attached).

There is no associated erythema and no stigmata of venous disease. The oedema pits when the skin is pressed. All pulses in the leg are palpable. What can be the cause for unilateral swelling? What further investigations are required? *This case is from Docplexus editorial team for educative purpose only Source: Case reports in general surgery