Ruptured Baker's cyst [top]

  • Sudden onset leg pain and swelling
  • Triggered by activity
  • Palpable mass behind knee
  • History of osteoarthritis

Lymphatic abnormality [top]

  • Unilateral / symmetrical peripheral oedema
  • Progressive onset over months / years
  • Persistent swelling, non-tender
  • History of lymphatic surgery, tropical infection, family history

Cellulitis [top]

  • Spreading confluent erythema
  • Leg swelling
  • Preceding injury / insect bite
  • Fever
  • Elevated inflammatory markers

Deep venous thrombosis [top]

  • Acutely red, tender, swollen leg
  • Risk factors: immobility, cancer, recent surgery, travel, oral contraceptive pill
  • Associated pulmonary embolism