a late-onset psoas abscess formation associated with previous appendectomy: a case report

psoas abscesses could originate from an adjacent source of infection in the abdominopelvic cavity known as a secondary complication of acute appendicitis. however, it is considered as a very rare event when occurring late after the presentation of appendicitis. whether it is the source or complication of acute appendicitis following appendectomy remains unclear. a 25-year-old man was admitted to our center with fever and abdominal pain. his past medical history was unremarkable except for having an acute appendicitis and complicated appendectomy 4 years before presenting illness. on admission, the patient was febrile with right lower quadrant abdominal tenderness and moderate leukocytosis. the abdominopelvic ct- scan revealed a large right psoas muscle than the opposite site, that contained a hypodense mass measuring 6 cm in diameter with extension into right iliacus and internal oblique muscles..the patient underwent subsequent percutaneous abscess drainage under image guide and concurrent broad-spectrum antibiotic therapy.