May Cause

Abdominal abscess

Abnormal left upper quadrant abdominal gas collection

Cystic renal mass with internal debris

Decreased renal artery diastolic flow

Early renal vein opacification

Extrinsic indentation on duodenum

Focal calcification in kidney

Increased retrogastric or retroduodenal space

Lesion of perinephric space

Mass displacing kidney

Paralyzed hemidiaphragm

Pleural effusion with disease in abdomen

Right anterior pararenal space abscess

T2-hyperintense renal mass

Unilateral absence or blurring of renal outline

May Be Caused by

Extraurinary infection

Fungus infection

Gas abscess

Infected hematoma

Infected urinoma

Obstructive uropathy

Removal of ureteral calculus

Trauma to kidney

Trauma to ureter

Tuberculosis

Ureteral catheterization

Urinary tract infection