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Epidural Abscess Secondary to Paravertebral Pyomyositis in a Patient with a Sacrococcygeal Suppurated Cyst

Dario Piazzalunga, Federico Coccolini, Nicola Colaianni, Roberto Manfredi, Alessandro Lunghi, Alessandra Tebaldi, Giulia Montori, Giulia Merigo, Luca Baiocchi, Nazario Portolani and Luca Ansaloni

Pyomyositis is a sub-acute bacterial infection involving the skeletal muscle that can occur in a primitive form (rare, more common in tropical climates and so called "tropical myositis") or secondary to inflammatory phenomena of the skin, subcutaneous, or adjacent bone. It has been described the possibility that an epidural abscess could complicate a myositis of the paraspinal muscles. Moreover exists the description of paravertebral myositis complicating a suppurated sacrococcygeal pilonidal cyst. In this case, the patient presents a sacrococcygeal abscess evolving to a paravertebral myositis and further to an epidural abscess that has never been described before.