On admission, patient had raised inflammatory/infective markers (high CRP, high white blood cell count). Ultrasound guided pigtail catheter drainage performed to the left retroperitoneal abscess. Pus culture isolated Escherichia coli. 
The admission urine biochemistry showed evidence of urinary tract infection (nitrite positive and presence of leukocytes). Urine culture also isolated E. coli.

Patient has uncontrolled diabetes mellitus which high blood glucose reading. Diabetic patients are prone to developing abscesses.

Patient was discharged well after one week of drainage and intravenous antibiotic (ampicillin) which was sensitive to the pathogen.