Escherichia coli-Induced Psoas Abscess in a Case of Chronic Kidney Disease.

A psoas abscess is an accumulation of pus in the muscular compartment of the iliopsoas. It can originate from a primary or secondary source. Hematogenous or lymphatic seeding from a distant place causes primary iliopsoas abscess. This is frequently linked to a chronic immunocompromised status and is more common in young people. Secondary psoas abscess is caused by infection spreading directly from a nearby structure to the psoas muscle, and it can be caused by trauma or instrumentation in the inguinal region, lumbar spine region, and hip region. Occurrence of psoas abscess is uncommon, and its diagnosis is frequently delayed due to non-specific symptoms. We discuss a patient with chronic kidney disease (CKD) on conservative management who presented to us with complaints of swelling in the right lower back and fever and who was subsequently diagnosed with a right psoas abscess. Microbiology culture of the pus confirmed Escherichia coli (E. coli) as the etiologic agent, which is rare.