Subtypes

Filling defect in calyx

Filling defect in infundibulum

Filling defect in renal pelvis

May Be Caused by

 Common

Angiomyolipoma

Blood clot

Hamartoma

Hemangioma

Kidney stone

Lymphoma

Metastasis

Normal renal artery or vein impression

Oncocytoma

Papilloma

Renal cell carcinoma

Renal sinus lipomatosis

Transitional cell carcinoma

Urinary tract gas

Wilms tumor

 Uncommon

Aberrant papilla

Amyloidosis

Hydatid cyst

Inflammatory polyp

Leukoplakia

Malacoplakia

Multicystic kidney with pelvoinfundibular atresia

Mycetoma

Parapelvic renal cyst

Parenchymal renal cyst

Polycystic kidney

Pyelitis cystica

Pyelonephritis with debris

Saccular aneurysm

Sloughed papilla

Urinary tract cholesteatoma

Urinoma