Primary psoas abscess caused by Streptococcus agalactiae

ABSTRACT

Group B streptococcus (Streptococcus agalactiae, GBS), a primary pathogen in postpartum infection, has rarely been reported in psoas abscess. Primary proas abscess occurs less frequently than secondary abscess, which originates from infections of adjacent organs, such as intraabdominal infection, osteomyelitis, perirenal abscess, and retroperitoneal hematomas. We describe a case of primary psoas abscess caused by GBS. A 44-year-old woman with type 2 diabetes mellitus presented with left flank pain, intermittent fever, dysuria, and discomfort during walking. Abdominal CT showed multiseptated cystic mass in wide areas of the retroperitoneal space. Pus culture showed Streptococcus agalactiae. The patient responded to penicillin G treatment for 3 weeks.