Necrotizing fasciitis following psoas muscle abscess caused by hypermucoviscous Klebsiella pneumoniae.

A 59-year-old Japanese diabetic woman was admitted to a small private hospital with general malaise, fever, and a 1-month history of low back pain. A computed tomography scan of the abdomen revealed left abdominal necrotizing fasciitis with suspected left psoas muscle abscess. She was transferred to Gunma University Hospital, received antibiotic therapy, and underwent debridement of the infected subcutaneous tissue, fascia, and necrotic left psoas muscle. She was transferred to the intensive care unit to receive mechanical ventilation and inotropic support. Blood culture showed growth of Klebsiella pneumoniae, from which hypermucoviscosity was detected by the string test. She was extubated on day 5 of hospitalization and transferred to a general ward on day 14. Free skin grafting was performed on day 76, and she was discharged on day 134 without any complications.