May Be Caused by

Abscess

Adenoma of adrenal gland

Adrenal mass

Ascites

Carcinoma of adrenal gland

Choledochal cyst

Cyst

Gastrointestinal stromal tumor of posterior wall of stomach

Hematoma

Hepatomegaly

Herniation of omentum

Hydronephrosis

Leiomyoma

Leiomyosarcoma

Lymphadenopathy

Lymphoma

Metastasis

Morgagni hernia

Neuroblastoma

Normal variant

Obesity

Pancreatic abscess

Pancreatic cancer

Pancreatic cystadenoma

Pancreatic mass

Pancreatic pseudocyst

Pancreatitis

Perinephric abscess

Perinephric hematoma

Pheochromocytoma

Postoperative state

Renal cell carcinoma

Renal cyst

Renal mass

Retroperitoneal cellulitis

Retroperitoneal edema

Retroperitoneal fibrosis

Retroperitoneal mass

Sarcoma

Tuberculosis

Urinary leakage

Wilms tumor