We analyzed the following CT findings: focal hypodense lesion within iliopsoas compartment, attenuation of abscess, location, number, size, infiltration of surrounding fat, gas bubbles or air-fluid level and rim enhancement on CT with contrast, infection from an adjacent structure (vertebral infection, appendicitis, diverticulitis, gastrointestinal fistula, rectal abscess, colorectal cancer, foreign body within iliopsoas muscle). Drainage and culture results were recorded.