title: A Late-onset Psoas Abscess Formation Associated with Previous Appendectomy: A Case Report.
abstract: 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.
authors.affiliation: Department  of General Surgery, Shiraz University of Medical Sciences, Shiraz, Iran.
authors.forename: Sam
authors.initials: S
authors.lastname: Moslemi
authors.affiliation: Department  of Internal Medicine, Shiraz University of Medical Sciences, Shiraz, Iran.
authors.forename: Maryam
authors.initials: M
authors.lastname: Tahamtan
authors.affiliation: Colorectal Research Center, Shiraz University of Medical Sciences, Shiraz, Iran.
authors.forename: Seyed Vahid
authors.initials: SV
authors.lastname: Hosseini
keywords: Appendectomy; Complicated acute appendicitis; Late-onset psoas abscess formation