Severe soft tissue infection masquerading as necrotising fasciitis in a 31-year-old woman with a background of right thigh arteriovenous malformation.

A 31-year-old woman with a history of a right thigh arteriovenous malformation presented with an acute history of right thigh pain and swelling. This rapidly progressed to gross sepsis. She was intubated, requiring inotropic support and renal replacement therapy. She was considered disproportionately unwell, with the impression one of necrotising fasciitis (NF). She was taken to theatre for emergency exploration and debridement. There was no evidence of NF to note in theatre. Tissue samples cultured group C Streptococcus, with histopathological examination confirming group C Streptococcal soft tissue infection. Thereafter, she was treated with high-dose intravenous antibiotics, use of a negative pressure wound therapy system, and multiple returns to theatre for repeat debridement. Her condition gradually improved, and she was stepped down to a surgical ward 3 weeks after admission. Nine weeks after initial presentation, she underwent skin grafting for wound closure. She returned to work 7 months later.