4. 1. Oncocytoma (Benign Oxyphilic
Adenoma):
โข Second most common benign renal tumor.
โข 6th
-7th
Decades.
โข Male:Female = 3-1
โข Asymptomatic.
โข 10% bilateral- 10% multiple.
โข In less than 10% of cases, oncocytoma and
chromophobe RCC may coexist
Renal tumors
6. A. Plain X-Ray:
โข Normal.
โข Soft tissue mass displacing renal shadow and
surrounding fat planes.
Oncocytoma
7. B. IVU:
โข Normal.
โข Soft tissue mass displacing
renal shadow and
surrounding fat planes.
Oncocytoma
8. C. US:
โข Well-defined.
โข Solid mass.
โข Homogenous.
โข Hypo- to isoechoic.
โข Hyperechoic central scar.
Oncocytoma
9. D. CT:
โข NECT scans, isoattenuating or
slightly hyperattenuating.
โข A central hypoattenuating scar
observed in 33% of cases
Oncocytoma
10. 1. CT:
โข CECT scans, nephrographic phase, the mass
appears less attenuating than the renal
parenchyma
Oncocytoma
11. E. MRI:
โข T1-weighted images:
โข Pre: isointense to hypointense relative to the
renal cortex.
Oncocytoma
12. E. MRI:
โข T1-weighted images:
โข Post: Homogeneous enhancement, with a
nonenhancing central scar.
Oncocytoma
13. E. MRI:
โข T2-weighted images:
โข Isointense to slightly hyperintense or
hypointense.
โข Spoke-wheel hypointense pattern.
Oncocytoma
14. F. Angiography:
โข Spoke-wheel arrangement of
tumoral vessels.
โข Homogeneous tumoral contrast
during the capillary phase.
โข Sharp demarcation from the
kidney and surrounding areas.
โข Peritumoral halo (lucent-rim sign).
โข The bizarre neoplastic vessels are
conspicuously absent, in contrast
to RCC.
Renal tumorsOncocytoma