A 46 year old man presented to the plastic surgery clinic with a painless, progressive swelling of the right leg of seven years duration. He reported difficulty with ambulation and recurrent ulceration in the past three years. The patient´s medical history was significant for hypertension. He had no allergies and no family history of lymphedema. On physical examination, the right leg was markedly enlarged from mid thigh to the foot. There were edematous changes with skin thickening. He had a septic ulcer on the medial surface of the leg (A). The mid leg circumference was 128 cm (B). Doppler findings of the leg were normal. What is your diagnosis?