What is the most common bacterium cause of emphysematous pyelonephritis?
Escherichia coli is the most common offending organism in emphysematous pyelonephritis.
What is the most common cause of false-positive diagnoses of emphysematous pyelonephritis based on conventional abdominal radiography and ultrasound?
The most common reason leading to the false-positive diagnosis of emphysematous pyelonephritis on both ultrasound and conventional radiography is bowel gas and gas-forming psoas abscess. Emphysematous pyelonephritis can be misinterpreted as renal stones on ultrasound.
Enhanced CT A/P to rule out abscess formation after 5 days of admission
Previous CT KUB study since few days was compared.
Double J stent is noted in the left urinary system.
The left kidney is swollen hypo-perfused left kidney showing pyelonephritic changes with focal cortical and subcapsular fluid collection measures 2.2x2.8 cm suggesting small abscess formation with mild perinephric fat stranding.
No right-sided focal or diffuse parenchymal lesion is detected.
No calculi, hydronephrosis.
Both ureters are normal in course and calibres with no calculi, filling defect, hydroureter or periureteric fat stranding seen.
The urinary bladder is normal in outline and enhancement.
Thin rim of pelvic and both iliac fossa fluid.
Lung bases show mild right pleural effusion with basal collapse.
Impression
Swollen hypo-perfused left kidney showing pyelonephritic changes with focal cortical and subcapsular collection suggesting small abscesses collections formation.