Gamuts
Unilateral absence or blurring of renal outline
May Be Caused by
Common
Congenital absence or aplasia of kidney
Displaced kidney
Insufficient perinephric fat
Nephrectomy
Overlying intestinal gas
Perinephric abscess
Retroperitoneal abscess
Retroperitoneal hematoma
Technical factors
Uncommon
Atrophic kidney
Ectopic kidney
Lymphocele
Renal vein thrombosis
Thromboembolism of inferior vena cava
Thromboembolism of renal artery
Urinoma