May Be Caused by

 Common

Angiomyolipoma

Calculus

Complex renal cyst

Dromedary hump

Hematoma

Hypertrophied column of Bertin

Infarct

Lobar dysmorphism

Metastasis to kidney

Normal renal parenchyma

Regenerated nodule

Renal abscess

Renal cell carcinoma

Renal contusion

Wilms tumor

 Uncommon

Abscess

Acute focal pyelonephritis

Arteriovenous malformation

Autosomal recessive polycystic kidney disease

Burkitt lymphoma

Cavernous hemangioma

Cholesteatoma

Fibroma

Granuloma

Hydatid cyst

Leukemia

Leukoplakia

Lipoma

Lymphoma

Malacoplakia

Mesoblastic nephroma

Oncocytoma

Osteosarcoma

Renal adenoma

Renal sinus lipomatosis

Sarcoma

Transitional cell carcinoma

Tuberculosis

Xanthogranulomatous pyelonephritis