"relatively homogeneous contrast enhancement (less than the renal cortex)."
"central scar in 19–34 % of cases, with a spoke-wheel pattern of enhancement in a minority of cases 5"
"This is the least common major subtype of RCC, occurring 5% of the time 1. Similar incidence in men and women. There is an association with Birt-Hogg-Dubé syndrome 4."