Burning Urination, Flank Pain

Lab results showed WBC: 14,500 mm3, S. urea: 46, and S. creatinine: 0.8.

Figure 1. Ultrasound images.

Figure 2. IVP image.

Figure 3. CT image.

Figure 4. MRI images.

Diagnosis: Oncocytoma in a horseshoe kidney

On Ultrasound, a well-circumscribed, hypoechoic lesion is noted in left kidney.

Renal oncocytoma is a type of relatively benign renal tumor.

On CT, oncocytoma generally tend to be large, well demarcated tumors at presentation with central stellate non-enhancing scar seen in approximately one-third of cases.