“…Pyometra in the gynecologic setting, which is rarely seen before menopause, is concerning for an underlying uterine malignancy. Although uncommon, uterine infections specifically caused by Clostridium have been identified in the setting of various gynecologic malignancies ( Table 1 ) ( Lacey et al, 1976 , Symonds and Robertson, 1978 , Braverman et al, 1987 May , Kurashina et al, 2010 , Shetty et al, 2010 , Kremer et al, 2017 Sep ). Interestingly, claudin-3 and claudin-4 receptors, transmembrane proteins that mediate clostridium perfringens enterotoxin (CPE) binding and cytolysis, were found to be overexpressed in carcinosarcoma ( Santin et al, 2007 ).…”